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Update simple_queries.sql #76

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Update simple_queries.sql #76

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14 changes: 10 additions & 4 deletions homework-2/simple_queries.sql
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Original file line number Diff line number Diff line change
@@ -1,14 +1,20 @@
-- Напишите запросы, которые выводят следующую информацию:
-- 1. "имя контакта" и "город" (contact_name, city) из таблицы customers (только эти две колонки)
SELECT ...
SELECT contact_name, city
FROM customers;

-- 2. идентификатор заказа и разницу между датами формирования (order_date) заказа и его отгрузкой (shipped_date) из таблицы orders

SELECT order_id, shipped_date - order_date AS date_difference
FROM orders;

-- 3. все города без повторов, в которых зарегистрированы заказчики (customers)

SELECT DISTINCT city
FROM customers;

-- 4. количество заказов (таблица orders)

SELECT COUNT(*) AS order_count
FROM orders;

-- 5. количество стран, в которые отгружался товар (таблица orders, колонка ship_country)
SELECT COUNT(DISTINCT ship_country) AS country_count
FROM orders;