我对这个查询有疑问:
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
产生错误
消息 156,级别 15,状态 1,第 7 行
关键字“LEFT”附近的语法不正确。
消息 156,级别 15,状态 1,第 16 行
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:感谢塞巴斯的帮助
*此查询是否有另一种方法来确保速度性能,因为我处理了大约 2500 MAILITM_FID?*
任何人都可以帮忙吗?谢谢