copycode/sqlite-guide.html at main · userbot000/copycode · GitHub

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<!DOCTYPE html>
<html lang="he" dir="rtl">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>מדריך SQLite מקיף - CopyCode</title>
    <link rel="icon" href="images/logo.png" type="image/png">

    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica', 'Arial', sans-serif;
            background: url('images/background.jpg') center center / cover no-repeat fixed;
            min-height: 100vh;
            line-height: 1.6;
            color: #2c3e50;
            position: relative;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.15) 0%, rgba(118, 75, 162, 0.15) 100%);
            z-index: 0;
            pointer-events: none;
        }

        .top-header {
            position: fixed;
            top: 0;
            right: 0;
            left: 0;
            height: 70px;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.3);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 2rem;
            z-index: 1000;
        }

        .site-logo {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            text-decoration: none;
            color: #1a1a1a;
            font-size: 1.3rem;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .site-logo:hover {
            color: #667eea;
        }

        .site-logo img {
            width: 40px;
            height: 40px;
        }

        .search-btn {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 1.5rem;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            text-decoration: none;
            border-radius: 12px;
            font-weight: 600;
            transition: all 0.3s ease;
            border: none;
            cursor: pointer;
        }

        .search-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
        }

        .search-btn svg {
            width: 20px;
            height: 20px;
        }

        .layout {
            display: flex;
            max-width: 1400px;
            margin: 0 auto;
            min-height: 100vh;
            position: relative;
            z-index: 1;
            padding-top: 90px;
        }

        .sidebar {
            width: 260px;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            padding: 2rem 1rem;
            margin-left: 1.5rem;
            position: sticky;
            top: 110px;
            height: calc(100vh - 130px);
            overflow-y: auto;
            border-left: 1px solid rgba(255, 255, 255, 0.3);
            box-shadow: 2px 0 12px rgba(0, 0, 0, 0.1);
            border-radius: 16px;
            scrollbar-width: none;
            -ms-overflow-style: none;
        }

        .sidebar::-webkit-scrollbar {
            display: none;
        }

        .sidebar-title {
            font-size: 1.1rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
            font-weight: 600;
            padding-bottom: 0.75rem;
            border-bottom: 2px solid #003B57;
        }

        .nav-menu {
            list-style: none;
        }

        .nav-item {
            margin-bottom: 0.25rem;
        }

        .nav-link {
            display: block;
            padding: 0.6rem 0.8rem;
            color: #5a6c7d;
            text-decoration: none;
            border-radius: 4px;
            transition: all 0.2s ease;
            font-size: 0.9rem;
            font-weight: 500;
        }

        .nav-link:hover {
            background: #ecf0f1;
            color: #2c3e50;
            padding-right: 1rem;
        }

        .nav-link.active {
            background: #003B57;
            color: white;
        }

        .container {
            flex: 1;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            margin: 0 1.5rem 1.5rem 1.5rem;
            border-radius: 16px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.3);
            overflow: hidden;
        }

        header {
            background: transparent;
            color: #1a1a1a;
            padding: 2.5rem 2rem;
            text-align: center;
            border-bottom: 1px solid #e9ecef;
        }

        h1 {
            font-size: 2.2rem;
            margin-bottom: 0.5rem;
            font-weight: 600;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 1rem;
        }

        h1 svg {
            width: 48px;
            height: 48px;
        }

        .subtitle {
            font-size: 1rem;
            opacity: 0.95;
            font-weight: 400;
        }

        .content {
            padding: 2.5rem;
        }

        .section {
            margin-bottom: 3rem;
        }

        .section-title {
            font-size: 1.6rem;
            color: #2c3e50;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #003B57;
            font-weight: 600;
        }

        .command-group {
            background: #f8f9fa;
            border: 1px solid #e1e8ed;
            border-radius: 6px;
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            transition: box-shadow 0.2s ease;
        }

        .command-group:hover {
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        }

        .command-title {
            font-size: 1.1rem;
            color: #2c3e50;
            margin-bottom: 1rem;
            font-weight: 600;
        }

        .command-wrapper {
            position: relative;
            margin: 0.8rem 0;
        }

        .command {
            background: #003B57;
            color: #A8E6CF;
            padding: 0.9rem 3rem 0.9rem 1rem;
            border-radius: 4px;
            font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
            font-size: 0.9rem;
            direction: ltr;
            text-align: left;
            border: 1px solid #005F73;
            position: relative;
            overflow-x: auto;
            white-space: pre-wrap;
            line-height: 1.5;
        }

        .copy-btn {
            position: absolute;
            right: 8px;
            top: 50%;
            transform: translateY(-50%);
            background: transparent;
            color: #7f8c8d;
            border: 1px solid #bdc3c7;
            padding: 0.4rem;
            border-radius: 3px;
            cursor: pointer;
            font-size: 0.75rem;
            transition: all 0.2s ease;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: monospace;
        }

        .copy-btn::before {
            content: '⧉';
            font-size: 1rem;
        }

        .copy-btn:hover {
            background: #ecf0f1;
            color: #2c3e50;
            border-color: #95a5a6;
        }

        .copy-btn:active {
            transform: translateY(-50%) scale(0.95);
        }

        .copy-btn.copied {
            background: #d5f4e6;
            color: #27ae60;
            border-color: #27ae60;
        }

        .copy-btn.copied::before {
            content: '✓';
        }

        .description {
            color: #5a6c7d;
            margin-bottom: 0.5rem;
            margin-top: 1rem;
            font-weight: 500;
            font-size: 0.95rem;
        }

        .explanation {
            background: #e8f4f8;
            border-right: 3px solid #003B57;
            padding: 0.75rem;
            margin: 0.5rem 0;
            border-radius: 4px;
            color: #34495e;
            font-size: 0.88rem;
            line-height: 1.5;
        }

        .note {
            background: #fff3cd;
            border-right: 3px solid #ffd43b;
            padding: 1rem;
            border-radius: 4px;
            margin: 1rem 0;
        }

        .note-title {
            font-weight: 600;
            color: #856404;
            margin-bottom: 0.5rem;
        }

        footer {
            background: linear-gradient(135deg, #003B57 0%, #005F73 100%);
            color: white;
            text-align: center;
            padding: 1.5rem;
            font-size: 0.85rem;
            border-top: 3px solid #003B57;
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1.5rem;
            margin-top: 1rem;
        }

        @media (max-width: 1024px) {
            .layout {
                flex-direction: column;
            }

            .sidebar {
                width: 100%;
                height: auto;
                position: relative;
                border-left: none;
                border-bottom: 2px solid #003B57;
            }

            .container {
                margin: 0 1rem 1rem 1rem;
            }
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 1.8rem;
            }

            .section-title {
                font-size: 1.4rem;
            }

            .command {
                font-size: 0.82rem;
                padding-left: 0.8rem;
            }

            .copy-btn {
                position: relative;
                display: block;
                margin-top: 0.5rem;
                right: 0;
                transform: none;
            }

            .copy-btn:active {
                transform: scale(0.95);
            }

            .command-wrapper {
                display: flex;
                flex-direction: column;
            }

            .content {
                padding: 1.5rem;
            }
        }

        .scroll-top {
            position: fixed;
            bottom: 2rem;
            left: 2rem;
            background: #003B57;
            color: white;
            width: 48px;
            height: 48px;
            border-radius: 4px;
            border: none;
            cursor: pointer;
            font-size: 1.3rem;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
            transition: all 0.2s ease;
            opacity: 0;
            visibility: hidden;
        }

        .scroll-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .scroll-top:hover {
            background: #005F73;
            transform: translateY(-3px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        }
    </style>
</head>
<body>
    <div class="top-header">
        <a href="index.html" class="site-logo">
            <img src="images/logo.png" alt="לוגו האתר">
            CopyCode
        </a>
        <a href="search.html" class="search-btn">
            <svg viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
                <path d="M21 21L15 15M17 10C17 13.866 13.866 17 10 17C6.13401 17 3 13.866 3 10C3 6.13401 6.13401 3 10 3C13.866 3 17 6.13401 17 10Z" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
            </svg>
            <span>חיפוש</span>
        </a>
    </div>
    <div class="layout">
        <nav class="sidebar">
            <div class="sidebar-title">תוכן עניינים</div>
            <ul class="nav-menu">
                <li class="nav-item"><a href="#basics" class="nav-link">יסודות SQLite</a></li>
                <li class="nav-item"><a href="#create" class="nav-link">יצירת טבלאות</a></li>
                <li class="nav-item"><a href="#insert" class="nav-link">הוספת נתונים</a></li>
                <li class="nav-item"><a href="#select" class="nav-link">שאילתות SELECT</a></li>
                <li class="nav-item"><a href="#update" class="nav-link">עדכון ומחיקה</a></li>
                <li class="nav-item"><a href="#joins" class="nav-link">JOIN וקשרים</a></li>
                <li class="nav-item"><a href="#functions" class="nav-link">פונקציות</a></li>
                <li class="nav-item"><a href="#indexes" class="nav-link">אינדקסים</a></li>
                <li class="nav-item"><a href="#transactions" class="nav-link">טרנזקציות</a></li>
                <li class="nav-item"><a href="#advanced" class="nav-link">נושאים מתקדמים</a></li>
            </ul>
        </nav>

        <div class="container">
        <header>
            <h1>
                <svg viewBox="0 0 256 256" xmlns="http://www.w3.org/2000/svg">
                    <rect width="256" height="256" rx="28" fill="#003B57"/>
                    <path d="M80 60h96v20H80zm0 40h96v20H80zm0 40h96v20H80zm0 40h96v20H80z" fill="#A8E6CF"/>
                    <circle cx="60" cy="70" r="8" fill="#A8E6CF"/>
                    <circle cx="60" cy="110" r="8" fill="#A8E6CF"/>
                    <circle cx="60" cy="150" r="8" fill="#A8E6CF"/>
                    <circle cx="60" cy="190" r="8" fill="#A8E6CF"/>
                </svg>
                מדריך SQLite מקיף
            </h1>
            <p class="subtitle">מסד נתונים קל ועוצמתי - מיסודות ועד מתקדם</p>
        </header>

        <div class="content">

            <!-- יסודות SQLite -->
            <section id="basics" class="section">
                <h2 class="section-title">יסודות SQLite</h2>

                <div class="note">
                    <div class="note-title">💡 מה זה SQLite?</div>
                    SQLite הוא מסד נתונים קל משקל שלא דורש שרת נפרד - הכל בקובץ אחד!
                    הוא מושלם לאפליקציות מובייל, אתרים קטנים, ופרויקטים אישיים.
                    SQLite משמש במיליארדי מכשירים ברחבי העולם.
                </div>

                <div class="command-group">
                    <h3 class="command-title">פקודות בסיסיות</h3>

                    <p class="description">פתיחת/יצירת מסד נתונים:</p>
                    <div class="command-wrapper">
                        <div class="command">sqlite3 database.db</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">הצגת כל הטבלאות:</p>
                    <div class="command-wrapper">
                        <div class="command">.tables</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">הצגת מבנה טבלה:</p>
                    <div class="command-wrapper">
                        <div class="command">.schema table_name</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">יציאה:</p>
                    <div class="command-wrapper">
                        <div class="command">.quit</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">הצגה מסודרת של תוצאות:</p>
                    <div class="command-wrapper">
                        <div class="command">.mode column
.headers on</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>
                </div>
            </section>

            <!-- יצירת טבלאות -->
            <section id="create" class="section">
                <h2 class="section-title">יצירת טבלאות</h2>

                <div class="command-group">
                    <h3 class="command-title">CREATE TABLE</h3>

                    <p class="description">טבלה בסיסית:</p>
                    <div class="command-wrapper">
                        <div class="command">CREATE TABLE users (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    email TEXT UNIQUE,
    age INTEGER,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
);</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <div class="explanation">
                        <strong>טיפוסי נתונים ב-SQLite:</strong><br>
                        • INTEGER - מספרים שלמים<br>
                        • REAL - מספרים עשרוניים<br>
                        • TEXT - טקסט<br>
                        • BLOB - נתונים בינאריים<br>
                        • NULL - ערך ריק
                    </div>

                    <p class="description">מחיקת טבלה:</p>
                    <div class="command-wrapper">
                        <div class="command">DROP TABLE IF EXISTS users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">שינוי טבלה - הוספת עמודה:</p>
                    <div class="command-wrapper">
                        <div class="command">ALTER TABLE users ADD COLUMN phone TEXT;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>
                </div>
            </section>

            <!-- הוספת נתונים -->
            <section id="insert" class="section">
                <h2 class="section-title">הוספת נתונים (INSERT)</h2>

                <div class="command-group">
                    <h3 class="command-title">הכנסת רשומות</h3>

                    <p class="description">הכנסה בסיסית:</p>
                    <div class="command-wrapper">
                        <div class="command">INSERT INTO users (name, email, age)
VALUES ('Alice', 'alice@example.com', 25);</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">הכנסת מספר רשומות:</p>
                    <div class="command-wrapper">
                        <div class="command">INSERT INTO users (name, email, age) VALUES
    ('Bob', 'bob@example.com', 30),
    ('Charlie', 'charlie@example.com', 28),
    ('Diana', 'diana@example.com', 22);</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">הכנסה עם כל העמודות:</p>
                    <div class="command-wrapper">
                        <div class="command">INSERT INTO users VALUES (NULL, 'Eve', 'eve@example.com', 27, CURRENT_TIMESTAMP);</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>
                </div>
            </section>

            <!-- שאילתות SELECT -->
            <section id="select" class="section">
                <h2 class="section-title">שאילתות SELECT</h2>

                <div class="command-group">
                    <h3 class="command-title">שאילתות בסיסיות</h3>

                    <p class="description">בחירת כל הנתונים:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT * FROM users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">בחירת עמודות ספציפיות:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT name, email FROM users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">סינון עם WHERE:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT * FROM users WHERE age > 25;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">מספר תנאים:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT * FROM users
WHERE age >= 25 AND age <= 30;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">חיפוש בטקסט (LIKE):</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT * FROM users WHERE name LIKE 'A%';</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>
                    <div class="explanation">% = כל דבר, _ = תו אחד</div>
                </div>

                <div class="command-group">
                    <h3 class="command-title">מיון והגבלה</h3>

                    <p class="description">מיון:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT * FROM users ORDER BY age DESC;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">הגבלת תוצאות:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT * FROM users LIMIT 10;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">דילוג והגבלה (pagination):</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT * FROM users LIMIT 10 OFFSET 20;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">ערכים ייחודיים:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT DISTINCT age FROM users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>
                </div>
            </section>

            <!-- עדכון ומחיקה -->
            <section id="update" class="section">
                <h2 class="section-title">עדכון ומחיקה</h2>

                <div class="command-group">
                    <h3 class="command-title">UPDATE</h3>

                    <p class="description">עדכון רשומה:</p>
                    <div class="command-wrapper">
                        <div class="command">UPDATE users
SET age = 26
WHERE name = 'Alice';</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">עדכון מספר שדות:</p>
                    <div class="command-wrapper">
                        <div class="command">UPDATE users
SET age = 31, email = 'bob.new@example.com'
WHERE id = 2;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <div class="note">
                        <div class="note-title">⚠️ זהירות!</div>
                        UPDATE ללא WHERE יעדכן את כל הרשומות!
                    </div>
                </div>

                <div class="command-group">
                    <h3 class="command-title">DELETE</h3>

                    <p class="description">מחיקת רשומה:</p>
                    <div class="command-wrapper">
                        <div class="command">DELETE FROM users WHERE id = 5;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">מחיקה עם תנאי:</p>
                    <div class="command-wrapper">
                        <div class="command">DELETE FROM users WHERE age < 18;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">מחיקת כל הנתונים:</p>
                    <div class="command-wrapper">
                        <div class="command">DELETE FROM users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>
                </div>
            </section>

            <!-- JOIN -->
            <section id="joins" class="section">
                <h2 class="section-title">JOIN - חיבור טבלאות</h2>

                <div class="command-group">
                    <h3 class="command-title">סוגי JOIN</h3>

                    <p class="description">INNER JOIN - רק רשומות תואמות:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT users.name, orders.product
FROM users
INNER JOIN orders ON users.id = orders.user_id;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">LEFT JOIN - כל המשתמשים גם ללא הזמנות:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT users.name, orders.product
FROM users
LEFT JOIN orders ON users.id = orders.user_id;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">חיבור מספר טבלאות:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT u.name, o.product, p.amount
FROM users u
INNER JOIN orders o ON u.id = o.user_id
INNER JOIN payments p ON o.id = p.order_id;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>
                </div>
            </section>

            <!-- פונקציות -->
            <section id="functions" class="section">
                <h2 class="section-title">פונקציות</h2>

                <div class="command-group">
                    <h3 class="command-title">פונקציות צבירה (Aggregate)</h3>

                    <p class="description">ספירה:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT COUNT(*) FROM users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">ממוצע, מינימום, מקסימום:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT AVG(age), MIN(age), MAX(age) FROM users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">סכום:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT SUM(price) FROM orders;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">קיבוץ (GROUP BY):</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT age, COUNT(*) as count
FROM users
GROUP BY age;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">סינון אחרי קיבוץ (HAVING):</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT age, COUNT(*) as count
FROM users
GROUP BY age
HAVING count > 2;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>
                </div>

                <div class="command-group">
                    <h3 class="command-title">פונקציות מחרוזות</h3>

                    <p class="description">אורך מחרוזת:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT name, LENGTH(name) FROM users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">אותיות גדולות/קטנות:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT UPPER(name), LOWER(email) FROM users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">חיתוך רווחים:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT TRIM(name) FROM users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">חיבור מחרוזות:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT name || ' - ' || email as full_info FROM users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>
                </div>

                <div class="command-group">
                    <h3 class="command-title">פונקציות תאריך ושעה</h3>

                    <p class="description">תאריך ושעה נוכחיים:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT datetime('now');</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">תאריך בלבד:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT date('now');</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">הוספת זמן:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT datetime('now', '+7 days');</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">פורמט תאריך:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT strftime('%d/%m/%Y', 'now');</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>
                </div>
            </section>

            <!-- אינדקסים -->
            <section id="indexes" class="section">
                <h2 class="section-title">אינדקסים (Indexes)</h2>

                <div class="note">
                    <div class="note-title">💡 למה אינדקסים?</div>
                    אינדקסים מאיצים שאילתות באופן דרמטי, במיוחד בטבלאות גדולות.
                    הם כמו תוכן עניינים בספר - מאפשרים למצוא מידע מהר יותר.
                </div>

                <div class="command-group">
                    <h3 class="command-title">יצירה וניהול</h3>

                    <p class="description">יצירת אינדקס:</p>
                    <div class="command-wrapper">
                        <div class="command">CREATE INDEX idx_users_email ON users(email);</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">אינדקס ייחודי:</p>
                    <div class="command-wrapper">
                        <div class="command">CREATE UNIQUE INDEX idx_users_email_unique ON users(email);</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">אינדקס על מספר עמודות:</p>
                    <div class="command-wrapper">
                        <div class="command">CREATE INDEX idx_users_name_age ON users(name, age);</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">מחיקת אינדקס:</p>
                    <div class="command-wrapper">
                        <div class="command">DROP INDEX idx_users_email;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">הצגת כל האינדקסים:</p>
                    <div class="command-wrapper">
                        <div class="command">.indexes users</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>
                </div>
            </section>

            <!-- טרנזקציות -->
            <section id="transactions" class="section">
                <h2 class="section-title">טרנזקציות (Transactions)</h2>

                <div class="note">
                    <div class="note-title">💡 מה זה טרנזקציה?</div>
                    טרנזקציה היא קבוצת פעולות שמתבצעות ביחד - או שהכל מצליח, או שהכל נכשל.
                    זה מבטיח שהמידע במסד הנתונים תמיד יהיה עקבי.
                </div>

                <div class="command-group">
                    <h3 class="command-title">שימוש בטרנזקציות</h3>

                    <p class="description">טרנזקציה בסיסית:</p>
                    <div class="command-wrapper">
                        <div class="command">BEGIN TRANSACTION;

UPDATE accounts SET balance = balance - 100 WHERE id = 1;
UPDATE accounts SET balance = balance + 100 WHERE id = 2;

COMMIT;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">ביטול טרנזקציה:</p>
                    <div class="command-wrapper">
                        <div class="command">BEGIN TRANSACTION;

DELETE FROM users WHERE age < 18;

ROLLBACK;  -- מבטל את כל השינויים</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <div class="explanation">
                        <strong>COMMIT</strong> - שומר את השינויים<br>
                        <strong>ROLLBACK</strong> - מבטל את השינויים
                    </div>
                </div>
            </section>

            <!-- נושאים מתקדמים -->
            <section id="advanced" class="section">
                <h2 class="section-title">נושאים מתקדמים</h2>

                <div class="command-group">
                    <h3 class="command-title">Views - תצוגות</h3>

                    <p class="description">יצירת View:</p>
                    <div class="command-wrapper">
                        <div class="command">CREATE VIEW active_users AS
SELECT id, name, email
FROM users
WHERE age >= 18;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">שימוש ב-View:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT * FROM active_users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">מחיקת View:</p>
                    <div class="command-wrapper">
                        <div class="command">DROP VIEW active_users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>
                </div>

                <div class="command-group">
                    <h3 class="command-title">Subqueries - תת-שאילתות</h3>

                    <p class="description">תת-שאילתה ב-WHERE:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT name FROM users
WHERE age > (SELECT AVG(age) FROM users);</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>
                    </div>

                    <p class="description">תת-שאילתה ב-FROM:</p>
                    <div class="command-wrapper">
                        <div class="command">SELECT * FROM (
    SELECT name, age FROM users WHERE age > 25
) AS young_users;</div>
                        <button class="copy-btn" onclick="copyCommand(this)"></button>