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Comments - User-Defined Variables

1 year, 5 months ago Fabio Valeri
Re: User-defined Variables

"Evaluation of *columns* is undefined". That is that SELECT @v:=5, @v=@v+5 may return [5,10] or [10,5] because the order of columns in SELECT col1, col2 does not follow from left to right? I assume that this is because of sql-philosophy (set theory) since order does not play a role. Is there a way to consider the order?

 
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