Where 좌변 Case문.

 WHERE ( A.F20CRT BETWEEN :as_date_dt_from AND :as_date_dt_to

      AND   ( V.ZC3CEM  LIKE :as_empno OR V.ZC3CEM2  LIKE :as_empno )

      AND   A.F20QDP BETWEEN :as_dept_cd_from AND :as_dept_cd_to

      AND   (CASE IFNULL(A.F20DOCN, '') WHEN '' THEN 'Y' ELSE 'N' END) = :as_erp_yn

      AND    A.F20STS    LIKE :as_sts )

        OR ( A.F20PRN = :as_key )

  WITH UR