How to multiple sum mysql?

Question

I have a script that sums everything in te field "total" and its ok.

$cleaner = $connection->query("SELECT *,SUM(total) as total FROM ventas where fecha='$datenow'");

but I want to create more filters, when the caja is nails

$cleanerx = $connection->query("SELECT *,SUM(total) as total FROM ventas where fecha='$datenow' and caja='NAILS'");

why is not working, I read the tutorials at php but I don't understand why is not working.

Answer 1

你可以这样做：

$cleaner = $connection->query("SELECT *,SUM(total) as total,(SELECT SUM(total) as total FROM ventas where fecha='$datenow' and caja='NAILS') as totalnails FROM ventas where fecha='$datenow'");