Question

我对此查询有疑问：

SELECT     RTRIM(LTRIM(L_MAILITMS.MAILITM_FID)) AS Ref30
         , IsNull (Ref33,0) as Ref33
FROM       L_MAILITM_EVENTS 
   INNER JOIN L_MAILITMS ON L_MAILITM_EVENTS.MAILITM_PID = L_MAILITMS.MAILITM_PID 
WHERE  (L_MAILITMS.MAIL_CLASS_CD = 'E') 
   AND (L_MAILITM_EVENTS.EVENT_OFFICE_CD = 1063) 
   AND (L_MAILITM_EVENTS.EVENT_TYPE_CD = 30) 
   AND (L_MAILITM_EVENTS.EVENT_GMT_DT >= CONVERT(DATETIME, '2012-05-27 00:00:00', 102)) 
   AND (L_MAILITM_EVENTS.EVENT_GMT_DT < CONVERT(DATETIME, '2012-05-28 00:00:00', 102))
LEFT OUTER JOIN 
  (
    SELECT   RTRIM(LTRIM(L_MAILITMS_1.MAILITM_FID)) as Ref3033
           , COUNT(*) as Ref33
    FROM     L_MAILITM_EVENTS as L_MAILITM_EVENTS_1 
       INNER JOIN  L_MAILITMS as L_MAILITMS_1 ON L_MAILITM_EVENTS_1.MAILITM_PID = L_MAILITMS_1.MAILITM_PID
    WHERE  (L_MAILITMS_1.MAIL_CLASS_CD = 'E') 
       AND (L_MAILITM_EVENTS_1.EVENT_OFFICE_CD = 1063) 
       AND (L_MAILITM_EVENTS_1.EVENT_TYPE_CD = 33) 
       AND (L_MAILITM_EVENTS_1.EVENT_GMT_DT >= CONVERT(DATETIME, '2012-05-27 00:00:00', 102))
    GROUP BY L_MAILITMS_1.MAILITM_FID
  )  ON L_MAILITMS.MAILITM_FID = L_MAILITMS_1.MAILITM_FID

生成错误

Msg 156，Level 15，State 1，Line 7
  关键字“LEFT”附近的语法不正确。
  消息156，15级，状态1，行16   关键字“ON”附近的语法不正确。

表L_MAILITMS_EVENTS：

MAILITM_PID     EVENT_OFFICE_CD    EVENT_TYPE_CD
-----------------------------------------------------------
1               1063               30
2               1063               30
2               1063               33
3               1063               33
3               1063               30
4               1063               30

表L_MAILITMS：

MAILITM_PID          MAILITM_FID        MAIL_CLASS_CD
-------------------------------------------------------
1                     123               E  
2                     452               E                
3                     369               E
4                     633               E

我想得到什么：

Ref30          Ref33
-----------------------
123            0
452            1
369            1
633            0

更新：感谢Sebas的帮助

*此查询是否有另一种方法可以确保速度性能，因为我对待2500 MAILITM_FID？*

有人可以帮忙吗？感谢

Answer 1

在WHERE语法下移动LEFT OUTER JOIN语法。

LEFT OUTER JOIN必须是FROM声明的一部分。

Answer 2

然后让我修改连接的位置：

    SELECT     RTRIM(LTRIM(m.MAILITM_FID)) AS Ref30
         , IsNull (Ref33,0) as Ref33
FROM       L_MAILITM_EVENTS me
   INNER JOIN L_MAILITMS m ON me.MAILITM_PID = m.MAILITM_PID
   LEFT OUTER JOIN (
            SELECT   RTRIM(LTRIM(m1.MAILITM_FID)) as Ref3033
                   , COUNT(*) as Ref33
            FROM     L_MAILITM_EVENTS me1
                        INNER JOIN L_MAILITMS m1 ON me1.MAILITM_PID = m1.MAILITM_PID
            WHERE  (m1.MAIL_CLASS_CD = 'E') 
               AND (me1.EVENT_OFFICE_CD = 1063) 
               AND (me1.EVENT_TYPE_CD = 33) 
               AND (me1.EVENT_GMT_DT >= CONVERT(DATETIME, '2012-05-27 00:00:00', 102))
            GROUP BY m1.MAILITM_FID
  ) oj ON m.MAILITM_FID = oj.Ref3033 
WHERE  (m.MAIL_CLASS_CD = 'E') 
   AND (me.EVENT_OFFICE_CD = 1063) 
   AND (me.EVENT_TYPE_CD = 30) 
   AND (me.EVENT_GMT_DT >= CONVERT(DATETIME, '2012-05-27 00:00:00', 102)) 
   AND (me.EVENT_GMT_DT < CONVERT(DATETIME, '2012-05-28 00:00:00', 102))

我没有检查你的联接的逻辑，我只是移动它们。试试看是否还有这种语法错误..

LEFT OUTER JOIN生成错误的语法

2 个答案: