How can we define constraints with user defined name


Asked by admin @ in Computer Science viewed by 438 People


How can we define constraints with user defined name?

O data type constraintOdata typeO A and BNone of these​

Answered by admin @



Answer:

Some CONSTRAINTS can be used along with the SQL CREATE TABLE statement. The general structure of the SQL CONSTRAINT is defined as: The CONSTRAINT keyword is followed by a constraint name followed by a column or a list of columns.

Constraint: Description

NOT NULL: This constraint confirms that a column cannot store NULL value

CHECK: A check constraint ensures that the value stored in a column meets a specific ...

UNIQUE: This constraint ensures that each row for a column must have a different value


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