: NULL : Data Types MySQL TUTORIALS
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113.1 .
Use 0 and '' is not NULL
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113.2 .
NULL values are presented last if you do ORDER BY ... DESC
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113.3 .
NULL values are presented first if you do ORDER BY ... ASC
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113.4 .
Two NULL values are regarded as equal in a GROUP BY
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113.5 .
In MySQL, 0 or NULL means false and anything else means true.
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113.6 .
Use the IS NULL and IS NOT NULL operators for NULL value
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113.7 .
NULL means 'a missing unknown value'
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Use 0 and '' is not NULL
