[GENERAL] Booleans and Casting

[Paul Ramsey]

I have the following SQL statement, which doesn't work (though I wish it
did):

  select sum(value * ( plulabel = 'FO' )) from btmm group by gis_tag;

PG quite correctly complains that:

  ERROR:  There is more than one possible operator '*' for types
'float4' and 'bool' You will have to retype this query using an explicit
cast      

However, when I do this:

  select sum(value * int( plulabel = 'FO' )) from btmm group by gis_tag;

I still get an error:

  ERROR:  No such function 'int' with the specified attributes 

I can find no function at all to use to cast booleans to what I want,
which is 1 = true, 0 = false (IE, the standard cast for boolean ->
number).

Any advice?


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     | Paul Ramsey
     | Refractions Research
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