[英]Not permitted when the subquery follows =, !=, <, <= , >, >= or when used as an expression
SELECT
a.APOIT AS 'Item',
(SELECT SUBSTRING(LTRIM(RTRIM(Requisition)), 1, 6) as Requisition
FROM DBO_POLB015.db_datareader.CMSFIL_POLB15 as b
WHERE b.PONO = a.APONO and b.Item = a.APOIT) as 'Req',
REPLACE(REPLACE(REPLACE(REPLACE(ltrim(rtrim(a.AD30A)) +
CASE
WHEN STUFF((SELECT '; ' + (LTRIM(RTRIM(AI50A)) + LTRIM(RTRIM(AI50B)) + LTRIM(RTRIM(AI50C)) )
FROM [DBO_CMSFIL].[dbo].[POTMDI]
LEFT OUTER JOIN [DBO_CMSFIL].[dbo].POTMDT ON POTMDI.APOIT = POTMDT.APOIT AND POTMDI.ADVNO = POTMDT.ADVNO AND POTMDI.ACONO = POTMDT.ACONO AND POTMDI.APONO = POTMDT.APONO
WHERE POTMDI.APONO = a.APONO and POTMDT.APOIT= a.APOIT
FOR XML PATH('')), 1, 1, '') IS NULL
THEN ''
ELSE STUFF((SELECT '; ' + (ltrim(rtrim(AI50A)) + ltrim(rtrim(AI50B)) + ltrim(rtrim(AI50C)))
FROM [DBO_CMSFIL].[dbo].[POTMDI]
LEFT OUTER JOIN [DBO_CMSFIL].[dbo].POTMDT ON POTMDI.APOIT = POTMDT.APOIT AND POTMDI.ADVNO = POTMDT.ADVNO AND POTMDI.ACONO = POTMDT.ACONO AND POTMDI.APONO = POTMDT.APONO
WHERE POTMDI.APONO = a.APONO and POTMDT.APOIT= a.APOIT
FOR XML PATH('')), 1, 1, '')
end,
'&',' & '),' ',''),''', '\'),'"', '\"') as Description,
a.AQTOR AS 'QtyOrdered',
A.AUM AS 'Units'
FROM
[DBO_CMSFIL].[dbo].[POTMDT] AS a
WHERE
a.APONO = '152988'
ORDER BY
a.APOIT
I get the following message: 我收到以下消息:
Subquery returned more than 1 value. 子查询返回的值超过1。 This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression. 当子查询遵循=,!=,<,<=,>,> =或将子查询用作表达式时,不允许这样做。
How can I fix this? 我怎样才能解决这个问题?
Exactly as the error message says: You have a subquery that's returning multiple columns and/or multiple rows into a context where only a SINGLE value+row is allowed. 恰如错误消息所述:您有一个子查询,该子查询将多列和/或多行返回到仅允许单个值+行的上下文中。
If it's multiple rows, you can trivially fix by switching to an IN
match. 如果是多行,则可以切换到IN
匹配来轻松解决。 If it's multiple fields, that's just flat-out wrong. 如果是多个字段,那完全是错误的。
SELECT (SELECT * FROM tablewithlotsoforws) // wrong
SELECT (SELECT singlefield FROM tablewithlotsofrows WHERE match=singlerow) // ok
SELECT ... WHERE foo = (SELECT lotsofrows FROM sometable) // wrong
SELECT ... WHERE foo IN (SELECT lotsofrows FROM sometable) // ok
SELECT ... WHERE foo IN (SELECT lotsofrows, evenmorerows FROM stable) // wrong again
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