On 21 Dec 2013, at 7:45pm, Giuseppe Costanzi <giuseppecosta...@gmail.com> wrote:

> I am not sure to have understood the  Igor's solution
> 
> ...SUM(stats.quantity * (stats.which_month = 1)) AS gen....
> 
> which is the meaning of the operator * in the statement?

Multiply.

It works because "stats.which_month = 1" is a boolean and therefore evaluates 
to either 0 or 1.

Simon.
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