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

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