学习Oracle日记（八）--ORACLE CASE WHEN

Ⅰ. ORACLE  WHERE 字句里面使用CASE WHEN 25行

Ⅱ.  嵌套使用 CASE WHEN  2~13行

SELECT 
       SUM(CASE WHEN M.MV_AVG < 800 AND C.THICKNESS >= 0.5  AND C.THICKNESS <= 0.9  THEN  (CASE WHEN D.MV_AVG = 0 OR D.MV_AVG IS NULL THEN 0 ELSE P.LENGTH / D.MV_AVG END ) END ) R1CD ,--1区间内长度/炉区速度
       SUM(CASE WHEN M.MV_AVG < 800 AND C.THICKNESS > 0.9  AND C.THICKNESS <= 1.3  THEN  (CASE WHEN D.MV_AVG = 0 OR D.MV_AVG IS NULL THEN 0 ELSE P.LENGTH / D.MV_AVG END) END ) R2CD ,--2区间内长度/炉区速度
       SUM(CASE WHEN M.MV_AVG < 800 AND C.THICKNESS > 1.3  AND C.THICKNESS <= 1.6  THEN  (CASE WHEN D.MV_AVG = 0 OR D.MV_AVG IS NULL THEN 0 ELSE P.LENGTH / D.MV_AVG END) END ) R3CD ,--3区间内长度/炉区速度
       SUM(CASE WHEN M.MV_AVG < 800 AND C.THICKNESS > 1.6  THEN  (CASE WHEN D.MV_AVG = 0 OR D.MV_AVG IS NULL THEN 0 ELSE P.LENGTH / D.MV_AVG END) END ) R4CD ,   --4区间内长度/炉区速度
       SUM(CASE WHEN M.MV_AVG >= 800 AND M.MV_AVG < 830 AND C.THICKNESS >= 0.5  AND C.THICKNESS <= 0.9  THEN   (CASE WHEN D.MV_AVG = 0 OR D.MV_AVG IS NULL THEN 0 ELSE P.LENGTH / D.MV_AVG END) END ) R5CD ,--5区间内长度/炉区速度
       SUM(CASE WHEN M.MV_AVG >= 800 AND M.MV_AVG < 830 AND C.THICKNESS > 0.9  AND C.THICKNESS <= 1.3  THEN  (CASE WHEN D.MV_AVG = 0 OR D.MV_AVG IS NULL THEN 0 ELSE P.LENGTH / D.MV_AVG END) END ) R6CD ,--6区间内长度/炉区速度
       SUM(CASE WHEN M.MV_AVG >= 800 AND M.MV_AVG < 830 AND C.THICKNESS > 1.3  AND C.THICKNESS <= 1.6  THEN  (CASE WHEN D.MV_AVG = 0 OR D.MV_AVG IS NULL THEN 0 ELSE P.LENGTH / D.MV_AVG END) END ) R7CD ,--7区间内长度/炉区速度
       SUM(CASE WHEN M.MV_AVG >= 800 AND M.MV_AVG < 830 AND C.THICKNESS > 1.6  THEN (CASE WHEN D.MV_AVG = 0 OR D.MV_AVG IS NULL THEN 0 ELSE P.LENGTH / D.MV_AVG END) END ) R8CD ,   --8区间内长度/炉区速度
       SUM(CASE WHEN M.MV_AVG >= 830 AND C.THICKNESS >= 0.5  AND C.THICKNESS <= 0.9  THEN  (CASE WHEN D.MV_AVG = 0 OR D.MV_AVG IS NULL THEN 0 ELSE P.LENGTH / D.MV_AVG END) END ) R9CD ,--9区间内长度/炉区速度
       SUM(CASE WHEN M.MV_AVG >= 830 AND C.THICKNESS > 0.9  AND C.THICKNESS <= 1.3  THEN  (CASE WHEN D.MV_AVG = 0 OR D.MV_AVG IS NULL THEN 0 ELSE P.LENGTH / D.MV_AVG END) END ) R10CD ,--10区间内长度/炉区速度
       SUM(CASE WHEN M.MV_AVG >= 830 AND C.THICKNESS > 1.3  AND C.THICKNESS <= 1.6  THEN   (CASE WHEN D.MV_AVG = 0 OR D.MV_AVG IS NULL THEN 0 ELSE P.LENGTH / D.MV_AVG END) END ) R11CD ,--11区间内长度/炉区速度
       SUM(CASE WHEN M.MV_AVG >= 830 AND C.THICKNESS > 1.6  THEN  (CASE WHEN D.MV_AVG = 0 OR D.MV_AVG IS NULL THEN 0 ELSE P.LENGTH / D.MV_AVG END) END ) R12CD    --12区间内长度/炉区速度
 FROM PRODCOIL_MV M , (SELECT M.PCOIL_SID , M.MV_AVG   FROM PRODCOIL_MV M  WHERE M.QDR_CHAN = 1  AND  M.PRODUCT_LINE = 'CGL1') D ,PRODCOILS P ,COILS  C  ,PRODCOILS_SOURCES S  
WHERE M.PCOIL_SID = P.PCOIL_SID 
  AND P.PCOIL_SID = S.PCOIL_SID
  AND S.COIL_SID = C.COIL_SID 
  AND M.PCOIL_SID = D.PCOIL_SID
  AND P.DUMMY_COIL = 0
  AND M.PRODUCT_LINE = 'CGL1'
  AND P.PRODUCT_LINE = 'CGL1'
  AND C.PRODUCT_LINE = 'CGL1'
  AND S.PRODUCT_LINE = 'CGL1'
  
  AND M.QDR_CHAN = (CASE WHEN 'CGL1' = 'CGL1' THEN 521 ELSE 531 END )
  AND P.PROD_DAY  BETWEEN TO_DATE('2014-12-01','YYYY-MM-DD') AND TO_DATE('2014-12-31','YYYY-MM-DD')