Difference between WHERE and HAVING clause.

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I am really very confused about HAVING and WHERE clause in SQL.
Can we use HAVING wherever we use WHERE??
I want to you that "What is the actual difference between WHERE and HAVING clause"???

I read a code project article about this but not really able to get the actual difference.

www.codeproject.com/Articles/25258/Where-Vs-Having-Difference-between-having-and-Wher

Somewhere i read "Having clause is used only with group functions whereas Where is not used with."

Is it really correct??
And is this the only difference??

Posted 17-Nov-13 9:44am

Atul Khanduri

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**Zoltán Zörgő** · Answer 1 · 2013-11-17T10:06:00

Solution 2

It is quite simple: a simple selection query runs on a base set, and returns the records that match the WHERE clause. If you use aggregation, you derive a new result set, that can be also filtered. For filtering based on the result of the aggregation itself you can use HAVING.

Posted 17-Nov-13 10:06am

Zoltán Zörgő

André Kraak · Answer 2 · 2013-11-17T10:03:00

Solution 1

This blog post Difference between WHERE vs HAVING clause in SQL - GROUP BY Comparison with Example[^] gives a good explanation of the difference.

WHERE is used for filtering the individual records and HAVING to filter the result off an aggregate function[^] on the used GROUP BY.

Posted 17-Nov-13 10:03am

André Kraak

Comments

Maciej Los 17-Nov-13 17:35pm

short and to the point!
My 5!

VeeraAnnapureddy · Answer 3 · 2013-11-17T18:28:00

Solution 3

SQL

You can use Having Clause with the GROUP BY function in query and WHERE Clause is applied to each row before they are part of the GROUP BY function in a query.

Posted 17-Nov-13 18:28pm

VeeraAnnapureddy