Sql Query To Use a Unique Key

Unique Key Constraint is used, when we want to keep the value of a specific column unique i.e non-repeatable. After creating a table using a unique key constraint, it doesn’t allow to insert of repeated value.

It will give an error (UNIQUE constraint failed: user_detail.email) while inserting the same email "fresherbell@gmail.com" more than one time.

Database

Theme

Output

Similar Program

#	Program	Language
1	Sql Query To Use a ' SELECT ' statement with the MIN() or MAX() function.	SQL
2	Sql Query To Use a ' SELECT ' statement with OR Operator	SQL
3	Sql Query To Insert Multiple Records At A Time In The Table	SQL
4	Sql Query to retrieve data using Order By in Random Order	SQL
5	Sql Query To Drop Table	SQL
6	Sql Query To Use a ' SELECT ' statement with DISTINCT() function.	SQL
7	Sql Query To Retrieve Employees Data	SQL
8	Sql query to use BETWEEN Operator	SQL
9	Sql Case Sensitive Example 3	SQL
10	Sql Query To Add Column Using ADD With ALTER Command	SQL
11	Sql Query To Use a ' SELECT ' statement with SUM() function.	SQL
12	Sql Case Sensitive Example 1	SQL
13	Sql Case Sensitive Example 5	SQL
14	Sql Example To Rename Table Name Using Alter Command	SQL
15	Sql Query to Truncate Table	SQL
16	Sql Query To Use a ' SELECT ' statement with IN Clause	SQL
17	Sql Query To use CHECK Constraint	SQL
18	Sql Query To Update Multiple Column	SQL
19	Sql Query to Create View	SQL
20	Sql Query To Use a ' SELECT ' statement with Alias or 'AS"	SQL
#	Program	Language

Sql Query To Use a Unique Key

Similar Program

About Fresherbell

Important Links

Social Media