function MAX with WHERE

[Jesús Alain Rodríguez Santos <wmaster@xxxxxxxxxxxxxxxx>]

I have someting like this:

$test = mysql_query("SELECT MAX(dato) AS datos FROM tabla WHERE campo_mes
= '$mes'");
$test_m = mysql_fetch_array($test);
$test_mes = $test_m['datos'];

print $test_mes

where $mes is a value
I need to know if something its wrong, because I don't recive any error,
but I see nothing




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