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Why does comparing a SQL date variable to null behave in this way?
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How to avoid returning a Null if there is no "else" condition in an If construct
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How to specify null value in MS Access through the JDBC-ODBC bridge?
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How to check if a column exists in a SQL Server table?
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What's the difference between is_null($var) and ($var === null)?
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NULL in MySQL (Performance & Storage)
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Why does the is operator return false when given null?