diff --git a/your-code/Challenge_1.csv b/your-code/Challenge_1.csv
new file mode 100644
index 0000000..cabe751
--- /dev/null
+++ b/your-code/Challenge_1.csv
@@ -0,0 +1,26 @@
+au_id,au_lname,au_fname,title,pub_name
+213-46-8915,Green,Marjorie,"The Busy Executive's Database Guide","Algodata Infosystems"
+409-56-7008,Bennet,Abraham,"The Busy Executive's Database Guide","Algodata Infosystems"
+267-41-2394,O'Leary,Michael,"Cooking with Computers: Surreptitious Balance Sheets","Algodata Infosystems"
+724-80-9391,MacFeather,Stearns,"Cooking with Computers: Surreptitious Balance Sheets","Algodata Infosystems"
+213-46-8915,Green,Marjorie,"You Can Combat Computer Stress!","New Moon Books"
+274-80-9391,Straight,Dean,"Straight Talk About Computers","Algodata Infosystems"
+712-45-1867,"del Castillo",Innes,"Silicon Valley Gastronomic Treats","Binnet & Hardley"
+722-51-5454,DeFrance,Michel,"The Gourmet Microwave","Binnet & Hardley"
+899-46-2035,Ringer,Anne,"The Gourmet Microwave","Binnet & Hardley"
+238-95-7766,Carson,Cheryl,"But Is It User Friendly?","Algodata Infosystems"
+427-17-2319,Dull,Ann,"Secrets of Silicon Valley","Algodata Infosystems"
+846-92-7186,Hunter,Sheryl,"Secrets of Silicon Valley","Algodata Infosystems"
+486-29-1786,Locksley,Charlene,"Net Etiquette","Algodata Infosystems"
+724-80-9391,MacFeather,Stearns,"Computer Phobic AND Non-Phobic Individuals: Behavior Variations","Binnet & Hardley"
+756-30-7391,Karsen,Livia,"Computer Phobic AND Non-Phobic Individuals: Behavior Variations","Binnet & Hardley"
+899-46-2035,Ringer,Anne,"Is Anger the Enemy?","New Moon Books"
+998-72-3567,Ringer,Albert,"Is Anger the Enemy?","New Moon Books"
+998-72-3567,Ringer,Albert,"Life Without Fear","New Moon Books"
+172-32-1176,White,Johnson,"Prolonged Data Deprivation: Four Case Studies","New Moon Books"
+486-29-1786,Locksley,Charlene,"Emotional Security: A New Algorithm","New Moon Books"
+807-91-6654,Panteley,Sylvia,"Onions, Leeks, and Garlic: Cooking Secrets of the Mediterranean","Binnet & Hardley"
+648-92-1872,Blotchet-Halls,Reginald,"Fifty Years in Buckingham Palace Kitchens","Binnet & Hardley"
+267-41-2394,O'Leary,Michael,"Sushi, Anyone?","Binnet & Hardley"
+472-27-2349,Gringlesby,Burt,"Sushi, Anyone?","Binnet & Hardley"
+672-71-3249,Yokomoto,Akiko,"Sushi, Anyone?","Binnet & Hardley"
diff --git a/your-code/UAT_Challenge_1.csv b/your-code/UAT_Challenge_1.csv
new file mode 100644
index 0000000..583bd5a
--- /dev/null
+++ b/your-code/UAT_Challenge_1.csv
@@ -0,0 +1,26 @@
+au_id,title_id,au_ord,royaltyper
+172-32-1176,PS3333,1,100
+213-46-8915,BU1032,2,40
+213-46-8915,BU2075,1,100
+238-95-7766,PC1035,1,100
+267-41-2394,BU1111,2,40
+267-41-2394,TC7777,2,30
+274-80-9391,BU7832,1,100
+409-56-7008,BU1032,1,60
+427-17-2319,PC8888,1,50
+472-27-2349,TC7777,3,30
+486-29-1786,PC9999,1,100
+486-29-1786,PS7777,1,100
+648-92-1872,TC4203,1,100
+672-71-3249,TC7777,1,40
+712-45-1867,MC2222,1,100
+722-51-5454,MC3021,1,75
+724-80-9391,BU1111,1,60
+724-80-9391,PS1372,2,25
+756-30-7391,PS1372,1,75
+807-91-6654,TC3218,1,100
+846-92-7186,PC8888,2,50
+899-46-2035,MC3021,2,25
+899-46-2035,PS2091,2,50
+998-72-3567,PS2091,1,50
+998-72-3567,PS2106,1,100
diff --git a/your-code/UAT_OK_CH1.xlsx b/your-code/UAT_OK_CH1.xlsx
new file mode 100644
index 0000000..a46dd9d
Binary files /dev/null and b/your-code/UAT_OK_CH1.xlsx differ
diff --git a/your-code/solutions.sql b/your-code/solutions.sql
new file mode 100644
index 0000000..7f918ca
--- /dev/null
+++ b/your-code/solutions.sql
@@ -0,0 +1,68 @@
+-- FIRST STEP : SEE THE TABLES AND THE NAMES OF THE FIELDS:
+SELECT * FROM authors;
+-- au_id, au_lname, au_fname, phone, address, city, state, zip, contract
+SELECT * FROM discounts;
+-- discounttype, stor_id, lowqty, highqty, discount
+SELECT * FROM employee;
+-- emp_id, fname, minit, lname,  job_id, job_lvl, pub_id, hire_date
+SELECT * from jobs;
+-- job_id, job_desc, min_lvl, max_lvl
+SELECT * FROM pub_info;
+-- pub_id, logo, pr_info 
+SELECT * FROM publishers;
+-- pub_id, pub_name, city, state, country
+SELECT * FROM roysched;
+-- title_id, lorange, hirange, royalty 
+SELECT * FROM sales;
+-- stor_id, ord_num, ord_date, qty, payterms, title_id
+SELECT * FROM stores;
+-- stor_id, stor_name, stor_address, city, state, zip
+SELECT * FROM titleauthor;
+-- au_id, title_id, au_ord, royaltyper
+SELECT * FROM titles;
+-- title_id, title, type, pub_id, price, advance, royalty, ytd_sales, notes, pubdate
+
+##CHALENGE 1. 
+-- Select the table in which each required field appear
+-- AUTHOR ID: au_id -> authors, titleauthor OK
+-- AUTHOR LAST NAME:  au_lname -> authors OK
+-- AUTHOR FIRST NAME: au_fname -> authors OK
+-- TITLE of the published title: title -> titles OK 
+-- PUBLISHER NAME: pub_name -> publishers
+-- *TITLEAUTHOR DIMENSION
+SELECT au_id,au_lname,au_fname from authors;
+SELECT A.au_id, B.au_lname, B.au_fname from titleauthor A left join authors B on A.au_id = B.au_id;
+SELECT A.au_id, A.au_lname, A.au_fname, C.title, D.pub_name from titleauthor B
+left join authors A ON A.au_id = B.au_id
+left join titles C ON B.title_id = C.title_id
+left join publishers D ON C.pub_id = D.pub_id
+;
+
+##CHALLENGE 2: INCLUDE TITLE(COUNT) PER AUTH:
+SELECT A.au_id, A.au_lname, A.au_fname, D.pub_name,count(C.title_id) AS 'total_titles' from titleauthor B
+left join authors A ON A.au_id = B.au_id
+left join titles C ON B.title_id = C.title_id
+left join publishers D ON C.pub_id = D.pub_id
+group by A.au_id, A.au_lname, A.au_fname, D.pub_name
+;
+
+
+##CHALLENGE 3: INCLUDE SOLD_TITLES(sum) PER AUTH - only first 3:
+SELECT A.au_id, A.au_lname, A.au_fname, sum(D.qty) AS 'sold_titles' from titleauthor B
+left join authors A ON A.au_id = B.au_id
+left join titles C ON B.title_id = C.title_id
+left join sales D ON C.title_id = D.title_id
+group by A.au_id, A.au_lname, A.au_fname
+ORDER BY SUM(D.qty) DESC
+LIMIT 3;
+;
+
+##CHALLENGE 4: INCLUDE SOLD_TITLES(sum) PER AUTH:
+SELECT A.au_id, A.au_lname, A.au_fname, sum(D.qty) AS 'sold_titles' from titleauthor B
+left join authors A ON A.au_id = B.au_id
+INNER join titles C ON B.title_id = C.title_id
+INNER join sales D ON C.title_id = D.title_id
+group by A.au_id, A.au_lname, A.au_fname
+ORDER BY SUM(D.qty) DESC
+;
+