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What is the difference between a HAVING CLAUSE and a WHERE
CLAUSE?
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Answer Posted / ravindran
1.WHERE clause can be used with SELECT,INSERT and UPADATE statements,where as HAVING clause can only be used with the SELECT statements.
2.WHERE filter after rows before aggregation(GROUPING),
where as,HAVING filters groups,after the aggregations are performed.
3.Aggregate functions cannot be used in the WHERE clause,unless it is in a sub query containing in a HAVING clause,where as,aggregate functions can be used in having clause.
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