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get_recordset_select ... NULL = -1 ?

 
Tim at Lone Pine Koala Sanctuary
Re: get_recordset_select ... NULL = -1 ?
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http://sqlfiddle.com/#!9/9eecb/36398/0

NULL <> -1 

evaluates to NULL, which is not true. This is in line with the SQL standard. NULL is not a value. A reasonably interpretation to help develop you intuition is that NULL means 'unknown value'. "Is an unknown different from -1?", well that is also unknown.

To get the logic you want, you would need to say (status <> -1 OR status IS NULL)

 
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