Below list is major difference between where and having in SQL
Server;
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Where
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Having
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The WHERE clause selects rows before grouping |
HAVING clause selects rows after grouping.
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Where clause states the criteria which individual records should meet to be selected by a query , used
without the GROUP BY clause.
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HAVING clause cannot be used without the GROUP BY clause.
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WHERE clause cannot contain aggregate functions
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HAVING clause can contain aggregate functions.
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WHERE is used before the aggregation takes place.
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HAVING is used to check conditions after the aggregation takes place.
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select City, CNT=Count(1) From Address Where State = 'MA' Group By City |
select City, CNT=Count(1) From Address Where State = 'MA' Group By City Having Count(1)>5 |
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