How can we define constraints with user defined name
Asked by admin @ in Computer Science viewed by 436 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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