Question

I have a union type query. How can I count the number of rows it queries?

mysql_query(
    "  (SELECT 1 as sort_col,performerid,pic0 
          FROM $table 
          WHERE performerid IS NOT NULL $performeridSql) 
    UNION 
       (SELECT 2 as sort_col,performerid,pic0 
          FROM $table 
          WHERE performerid IS NOT NULL 
              $categorySql $buildSql 
              $breastsize $haircolor $age $ethnicity 
              $willingnessSql) 
          ORDER BY sort_col");

Answer 1

Simply count the subquery results…

SELECT COUNT(t.*) FROM
(   (SELECT 1 AS sort_col,performerid,pic0 
       FROM $table 
       WHERE performerid IS NOT NULL 
         $performeridSql) 
  UNION 
    (SELECT 2 AS sort_col,performerid,pic0 
       FROM $table 
       WHERE performerid IS NOT NULL 
         $categorySql $buildSql 
         $breastsize $haircolor $age $ethnicity 
         $willingnessSql)
  ORDER BY sort_col)
) AS t