Can any one please provide me practical example of How to
do the performance tuning in Query??
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Answer Posted / subbareddy kake
I will give you example for this....
Select *from emp where deptno=20 and empno:7788
above query will take much time to execute compared to
bellow query
Select *from emp where empno=7788 and deptno=20
becoz first query will take 1st all 20th dept emps and
again it will search for specific empno.but second query
will search first 7788 empno next it will see,that empno is
related to 20th dept or no.
So it will take less time for execution.
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