PHP test null.php

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Hostnamefreddy
uname -aLinux freddy 4.10.0-22-generic #24-Ubuntu SMP Mon May 22 17:43:20 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
date2017-06-16

SELECT top 1 * FROM #MyTable WHERE n = 1 -- '' -> (Empty String)
SELECT top 1 * FROM #MyTable WHERE n = 2 -- NULL -> (NULL)
SELECT top 1 * FROM #MyTable WHERE n = 3 -- ' ' -> ' '
SELECT top 1 * FROM #MyTable WHERE n = 4 -- 'a' -> 'a'

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