How to define unique key in table? Is it possible to define one primary key and one unique key in a single table?

asifeqbal

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• Mar 19th, 2015

UNIQUE key constraint enforce uniqueness of the column on which they are defined. It allows the column to have distinct & one NULL values. We can make one or more columns unique in a table by defining...

erik

• Jul 21st, 2012

SQL UNIQUE key... The UNIQUE constraint uniquely identifies each record in a database table. The UNIQUE and PRIMARY KEY constraints both provide a guarantee for uniqueness for a column or set of col...

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