At 10:29 -0600 1/9/03, Meena Vyavahare wrote:
>Here is my query-
>Select col1, col2, count(*) as total, count(col3 < col4) as violations
>group by col1, col2
>The result of this query shows same values at both the columns for total
>The count(expr) does not work????
Sure it does. It's counting non-NULL values. If no values in col3 or
col4 are NULL, then col3 < col4 evaluates to either 0 or 1 and is
counted, and your total will be the same as COUNT(*).
You probably want SUM(col3 < col4,1,0) instead.