Isnull vs coalesce?

I have read in the past that isnull might be minimally faster, but have not seen enough of a gain in practice to verify See T-SQL: COALESCE vs. ISNULL vs. IS NULL OR.

I have read in the past that isnull might be minimally faster, but have not seen enough of a gain in practice to verify. See T-SQL: COALESCE vs. ISNULL vs. IS NULL OR.

2 +1 Specifically this is the case when the expression is a sub query. With COALESCE the sub query gets evaluated twice. Connect Item – Martin Smith Sep 13 at 21:54 I read the same thing in a different blog and the guy performed a pretty extensive testing demonstrating that ISNULL may be substantially faster on very active queries.

I will try to find the link. – Icarus Sep 13 at 21:58.

I think not, but COALESCE is in the SQL '92 standard and supported by more different databases. If you go for portability, don't use IFNULL.

– Gabriel Sep 13 at 21:44 1 My point exactly. ;-D And it is NVL in Oracle. – GolezTrol Sep 13 at 21:45.

Where there is only one null condition, ISNULL will have less overhead. The difference is probably negligible, though.

I have read in the past that isnull might be minimally faster, but have not seen enough of a gain in practice to verify.

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