Yggaz (12/21/2012)
There is just one variant of one aggregate function that DOES take nulls into account: COUNT(*).However, it is uncompatible with DISTINCT clause.
SELECT COUNT(col1) as cnt_col1
, COUNT(*) as cnt_asterisk
FROM #testAggregates
(8, 10)
I do not agree with this. COUNT(*) only considers counting the number of rows. It does not even bother to take a look at the columns and there values. Hence COUNT(*) is not the variant.
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