OUTER JOIN 사용예
SELECT A.SDATE ,A.OUTLET ,D.STORE_NM_KOR ,A.BILL ,B.SALETIME ,B.MENUCODE ,E.MENU_NM ,B.PRICE ,B.QTY ,B.NETAMT ,ISNULL(C.GRP_NM,'') AS GRP_NM ,ISNULL(C.DTL_NM,'') AS DTL_NM ,B.DCRATE ,B.DCAMT FROM POSALHEADER A LEFT OUTER JOIN COMMONCD C ON C.SYS_CD = '04' AND C.DTL_CD = SUBSTRING(A.DCREASON, 5, 2) AND C.GRP_CD = SUBSTRING(A.DCREASON, 1, 4) ,POSALITEM B ,STORE D ,MENU E WHERE A.SDATE BETWEEN '20..