Re: Do I just not understand count()

If I have the table t defined as:

a
---
1
1
2

and I say:

select count(a=1) from t;

should it give me 1 or 2 as a result? I'm getting 2, and I'd think I
should get 1....

It will give you a result of 3, as a=1 does not toss out rows for which a <>
1.

You would need to add some parameters to limit the rows that count is
countin...
select count(a) from t where a = 1
would give you 2

select count(DISTINCT a) from t where a = 1
would give you 1