Sql unique

Sql unique select

SELECT DISTINCT col1, col2, ....
FROM table_name;

SELECT col1, MIN(col2)
FROM table_name
GROUP BY col1;

Sql unique

This constraint ensures all values in a column are unique.
Example 1 (MySQL): Adds a unique constraint to the id column when
creating a new users table.
CREATE TABLE users (
id int NOT NULL,
name varchar(255) NOT NULL,
UNIQUE (id)
);
Example 2 (MySQL): Alters an existing column to add a UNIQUE
constraint.
ALTER TABLE users
ADD UNIQUE (id);

Similar codes

1 vote137 views1 answer
Mysql size int
SQL
0 vote140 views1 answer
Could not assemble any primary key columns for mapped table sqlalchemy
SQL
0 vote140 views1 answer
Django mysqlclient connection string
SQL
4 votes137 views6 answers
List all tables in postgres
SQL
3 votes142 views1 answer
Oracle get trigger ddl
SQL
0 vote123 views1 answer
Sql select lowest value row
SQL
0 vote132 views1 answer
Remove mysql from centos 7
SQL
0 vote132 views1 answer
Cannot pip install mysqlclient
SQL
1 vote133 views1 answer
Oracle get current schema
SQL
6 votes159 views1 answer
To count number of rows in SQL table
SQL