Which will execute fast??

select count(*) from T1
select count(1) from T1
select count(PK) from T1:confused:

I think all the three take the same time.

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suresh

No.
2nd and 3rd will be fast than 1st query.:confused:
But amng 2nd and 3rd which will b fast,i dont know...

All the three will give you same performance. But there will be difference if you are using oracle version 8 or before.
In that case 2nd wil be faster than 1st. and 3rd will be the fastest.