The UNIQUE Constraint prevents identical values in a particular column.The UNIQUE constraint provide a guarantee for uniqueness for a column or set of columns.
EAMPLES:-
ADDING UNIQUE KEY
DROPING UNIQUE KEY
The UNIQUE Constraint prevents identical values in a particular column.The UNIQUE constraint provide a guarantee for uniqueness for a column or set of columns.
EAMPLES:-
ADDING UNIQUE KEY
DROPING UNIQUE KEY