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What is the difference between having and where clause?

Question Posted / honeysukumar

Answers were Sorted based on User's Feedback



What is the difference between having and where clause?..

Answer / thirumal reddy

where clause used to impose conditions in any dml operation
ex:
selct * from emp where empid=10
having clause used to impose conditions on group data
ex:

select sum(sal),avg(sal),count(*) from emp
having avg(sal)>2000

Is This Answer Correct ?    9 Yes 0 No

What is the difference between having and where clause?..

Answer / sd

Where clause operates on the selection before the rows are
actually grouped.

Hence , Try to add as many condition as possible in where
clause instead of having to boost the SQL query performance.

Is This Answer Correct ?    8 Yes 2 No

What is the difference between having and where clause?..

Answer / vinay singh

We can't use Where clause with aggregate function and Having
clause always use with aggregate function.

**Vinay Singh

Is This Answer Correct ?    6 Yes 2 No

What is the difference between having and where clause?..

Answer / kundan ravi

having clause alwaye use with aggregate functions and where
clause use for conditions but not with aggregate functions.

Is This Answer Correct ?    2 Yes 3 No

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