Sql constarint

It creates a new constraint on an existing table, which is used to specify
rules for any data in the table.
Example: Adds a new PRIMARY KEY constraint named ‘user’ on columns
ID and SURNAME.
ALTER TABLE users
ADD CONSTRAINT user PRIMARY KEY (ID, SURNAME);

Similar codes

0 vote142 views3 answers
Condition in count sql
SQL
1 vote133 views1 answer
Get url of cpanel database hostname
SQL
0 vote144 views1 answer
R rmysql connect local database Plugin caching_sha2_password could not be loaded
SQL
0 vote140 views1 answer
How to find columns with null values in sql
SQL
0 vote145 views1 answer
Consecutive numbers sql
SQL
0 vote137 views1 answer
Oracle sql generate list of days
SQL
3 votes130 views2 answers
Mysql create database
SQL
3 votes132 views3 answers
Mysqldump: couldn
SQL
0 vote144 views1 answer
Mysql foreach insert
SQL
0 vote137 views1 answer
Foreign key type uniqu mysql
SQL