there is no && character matrix supported in the SQL92 spec located at
also there is no Truth Table for && but there IS a truth table for AND
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> Subject: && vs AND
> From: daevid@stripped
> To: mysql@stripped
> Date: Mon, 2 Mar 2009 13:04:32 -0800
> Someone sent me a huge SQL query today that used "&&" instead of "AND"
> all over the place. I was a bit surprised that it is legal mySQL, but I
> was always under the impression that is not proper. Can anyone confirm
> or deny this? Like will ALL SQL RDBMS support that syntax?
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