Jeffrey Williams 3188 (10/22/2013)
Sean Lange (10/22/2013)
polkadot (10/22/2013)
According to your rules neither of these is accurate. They will both allow columns with the string literal 'NULL'. If you are ok with ignoring rule #3 than I would do a slightly different version of (2).
Case when ISNULL(realname, '') = '' AND ISNULL(computer_name, '') = '' then email
To handle the word NULL, couldn't we do this?
Case when ISNULL(NULLIF(realname, 'NULL'), '') = '' AND ISNULL(NULLIF(computer_name, 'NULL'), '') = '' then email
Nicely done!!! I think that should do it.
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