COLLATE DATABASE_DEFAULT agaisnt IN()子句

Question

我在sproc中返回记录时遇到问题.没有抛出错误,但我认为来自一个服务器环境的数据在另一个服务器环境中混合不好.

set @shipedon =  YEAR(@shipdate) * 10000 + MONTH(@shipdate) * 100 + DAY(@shipdate)

这有效:

SELECT   [ITEM_KEY],
         max([REVISION]) Rev
FROM     SERVER2.[BOMSystem].[dbo].[ITEM]
WHERE    ITEM_KEY collate DATABASE_DEFAULT in
         ('391000180', '391000189', '391000191', '391000201',
          '391000214', '391000215', '391000216', '391000226')
AND      DATE_EFF_FROM <= @shipedon 
GROUP BY ITEM_KEY

显示8行,如:

391000180   0001
391000189   0001
391000191   0001

这失败了:

SELECT   [ITEM_KEY],
         max([REVISION]) Rev
INTO     #rev
FROM     SERVER2.[BOMSystem].[dbo].[ITEM] 
WHERE    ITEM_KEY collate DATABASE_DEFAULT in (@items)                                                       
AND      DATE_EFF_FROM  <= @shipedon
GROUP BY ITEM_KEY

SELECT * from #rev shows no results.

SELECT @items = SUBSTRING(
(SELECT distinct ',' +''''+ ltrim(rtrim(ItemNumber )) +'''' 
collate DATABASE_DEFAULT 
FROM #ShipTemp   
FOR XML PATH('')),2,20000) 

Answer 1

不需要将它们全部连接成逗号分隔的字符串.

IN接受一个子查询,该子查询返回要测试的单个项目列.只是用

SELECT [ITEM_KEY],
       max([REVISION]) Rev
INTO   #rev
FROM   SERVER2.[BOMSystem].[dbo].[ITEM]
WHERE  ITEM_KEY COLLATE DATABASE_DEFAULT IN (SELECT LTRIM(ItemNumber )
                                             FROM   #ShipTemp)
       AND DATE_EFF_FROM <= @shipedon
GROUP  BY ITEM_KEY 

也不需要RTRIM在比较中作为尾随空格不重要,如果ItemNumber是数字,则应使用numeric数据类型,而不是字符串.