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difference between UNION ALL Statement and UNION
Posted Date: 18 Sep 2008 Resource Type:
Definitions
Category:
General
Posted By:
prasanthkumar
Member Level:
Gold
Rating:
Points
: 3
The main difference
* UNION All statement---- is much faster than UNION,
Reason:
==============
UNION ALL statement does not look for duplicate rows.
UNION statement does look for duplicate rows, whether or not they exist.
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