David Gauthier <davegauthierpg@xxxxxxxxx> writes: > dvdb=# select > CASE col1 > WHEN null THEN 'z' > ELSE col1 > END as col1, > col2 > from foo; This test is equivalent to "col1 = null" which will always fail. You could try something like CASE WHEN col1 IS NULL THEN ... ELSE ... END Although I think the particular thing you're doing here would be better solved with COALESCE(col1, 'z'). regards, tom lane
