we can create a column with' not null+unique' with out using primary key

PRADEEP

• Oct 17th, 2012

Primary key: set of columns is uniquely identified a rows of a table. It does not allow both nulls and duplicate values. If we use null values it will allow duplicate values but it does not allow n...

Radha

• Jul 14th, 2011

We can create NOTNULL and UNIQUE constraints on single column. Which indirectly means a Primary Key. But only a Primary Key column can be used as Foreign key column. Primary key provides a default...

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