Constraint sql

create table etc(
  numeric (4) anything constraint Gives_name_to_a_restriction primary key);

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);

Constraint

print("hello world");
alert(print);

-1

Similar codes

3 votes130 views1 answer
How to remove characters from string in mysql
SQL
0 vote138 views1 answer
Select amount weeks between two dates mysql
SQL
5 votes138 views3 answers
Sql make column nullable
SQL
2 votes129 views1 answer
Get first 2 letter in sql
SQL
0 vote159 views1 answer
Sql basic commands
SQL
5 votes129 views1 answer
Sqlite alter table add column
SQL
1 vote154 views1 answer
Cannot define PRIMARY KEY constraint on nullable column in table 'Student'.
SQL
4 votes144 views4 answers
Check constraint in ms sql
SQL
0 vote162 views1 answer
Import sql inside hide sql
SQL
2 votes156 views1 answer
Removing view
SQL