[marto]

Prueba con esto

Código SQL [-]
UPDATE familias 
          SET `elementos` = (
               SELECT COUNT(`id_producto`) 
                 FROM productos 
                 WHERE `id_area`='00001' 
                        and `id_familia`='00000' 
                        and `id_subfamilia`='00000'
                 ) 
           WHERE `id_area`='00001' and `id_familia`='00000' and  `id_subfamilia`='00000';