What?s the difference between PRIMARY KEY and UNIQUE in
MyISAM?
Answers were Sorted based on User's Feedback
Answer / amith
PRIMARY KEY cannot be null, so essentially PRIMARY KEY is
equivalent to UNIQUE NOT NULL
Is This Answer Correct ? | 28 Yes | 8 No |
Answer / niraj kumar
primary key is not accept the null value.primary key is
always autoincrement.unique key is accept the one null
value.it is not a autoincrement.
Is This Answer Correct ? | 4 Yes | 15 No |
Answer / manish
Primary Keys are used in building relationships between
tables in a database. (an index is automatically created on
the primary key). The difference between primary and
ordinary keys is that there can be multiple keys, but only
one primary key.
Is This Answer Correct ? | 7 Yes | 20 No |
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