当子查询跟随 =,!=,<,<=,>,>= 或当子查询用作表达式时，子查询返回的值不允许超过 1 个答案

【问题标题】：Subquery returned more than 1 value not permitted when subquery follows =,!=,<,<=,>,>= or when subquery used as an expression当子查询跟随 =,!=,<,<=,>,>= 或当子查询用作表达式时，子查询返回的值不允许超过 1 个
【发布时间】：2017-08-21 12:12:29
【问题描述】：

当我在 sql server 视图中选择行时出现标题错误。

这是我的代码

CREATE VIEW vw_cashbook AS
SELECT cashbooktranno, 
       cashbookdate, 
       cashbookrefaccname, 
       cashbookgroupname, 
       cashbookaccname, 
       cashbookdescription, 
       cashbookreceipt, 
       cashbookpayment,
       (select sum(cashbook.cashbookreceipt) - sum(cashbook.cashbookpayment) from tbl_cashbook) as totalpayment,
       company.companyname
FROM tbl_cashbook cashbook 
  LEFT OUTER JOIN tbl_companyregistration company 
               ON cashbook.branchid = company.companyid
group by cashbooktranno, cashbookdate, cashbookrefaccname, cashbookgroupname, cashbookaccname, 
cashbookdescription, cashbookreceipt, cashbookpayment, company.companyname

现在，此代码用于从表中创建视图。这段代码非常完美，因此根据我的视图也创建的代码。现在，问题是当我从创建的视图中选择行或编辑视图时，它会显示错误

子查询返回超过 1 个值。当子查询跟随 =、!=、、>= 或子查询用作表达式时，这是不允许的。

这是我对视图的选择查询

SELECT TOP 1000 [cashbooktranno]
      ,[cashbookdate]
      ,[cashbookrefaccname]
      ,[cashbookgroupname]
      ,[cashbookaccname]
      ,[cashbookdescription]
      ,[cashbookreceipt]
      ,[cashbookpayment]
      ,[totalpayment]
      ,[companyname]
  FROM [AutoFinanceSoftware].[dbo].[vw_cashbook]

那么我的查询有什么问题还是有其他问题。

【问题讨论】：

您能告诉我们您用来从该视图中选择的查询吗？
您在创建视图时是否收到该错误？
@MartinBrown 我已经更新了我的问题中的选择查询，请查看它。
@LasseV.Karlsen 没有。创建视图时我没有收到任何错误。
如果只执行视图创建的 SELECT 部分会发生什么，它也会失败吗？

标签： sql-server tsql

【解决方案1】：

不需要子查询。使用：

CREATE VIEW vw_cashbook AS
SELECT cashbooktranno, 
       cashbookdate, 
       cashbookrefaccname, 
       cashbookgroupname, 
       cashbookaccname, 
       cashbookdescription, 
       cashbookreceipt, 
       cashbookpayment,
       sum(cashbook.cashbookreceipt) - sum(cashbook.cashbookpayment) as totalpayment,
       company.companyname
FROM tbl_cashbook cashbook 
  LEFT OUTER JOIN tbl_companyregistration company 
               ON cashbook.branchid = company.companyid
group by cashbooktranno, cashbookdate, cashbookrefaccname, cashbookgroupname, cashbookaccname, 
cashbookdescription, cashbookreceipt, cashbookpayment, company.companyname;

甚至（如果两列都是NOT NULL）：

CREATE VIEW vw_cashbook AS
SELECT cashbooktranno, 
       cashbookdate, 
       cashbookrefaccname, 
       cashbookgroupname, 
       cashbookaccname, 
       cashbookdescription, 
       cashbookreceipt, 
       cashbookpayment,
       sum(cashbook.cashbookreceipt - cashbook.cashbookpayment) as totalpayment,
       company.companyname
FROM tbl_cashbook cashbook 
  LEFT OUTER JOIN tbl_companyregistration company 
               ON cashbook.branchid = company.companyid
group by cashbooktranno, cashbookdate, cashbookrefaccname, cashbookgroupname, cashbookaccname, 
cashbookdescription, cashbookreceipt, cashbookpayment, company.companyname

【讨论】：