Question

我有一个包含20个值的多选下拉列表。用户可以选择全部或少数。

我想写一个查询

如果用户选择了所有值，则我不想传递所有选定的值。（我将传递0以确定所有值都已选中）
如果使用选择了少数（或不是全部），那么我只想传递那些选定的值。（我将通过逗号分隔值ex 101,102,103,104）

根据我想要的值编写连接表或在where条件

我做了类似下面的事情，但似乎没有用。

WHERE：抛出错误（Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression.）

DECLARE @EntitiyIds  AS varchar(2500) = '0'
SELECT * 
FROM Tb_CompanyType 
WHERE Id  IN (
            CASE WHEN @EntitiyIds <> '0' THEN (SELECT Item FROM dbo.Split(@EntitiyIds, ','))
                 WHEN @EntitiyIds =  '0' THEN (SELECT Id FROM Tb_CompanyType) END 
          )

INNER JOIN :(以下没有给出正确的输出）

DECLARE @EntitiyIds  AS VARCHAR(2500) = '101'

SELECT * FROM Tb_CompanyType CT
INNER JOIN Tb_Company TC ON 
                        CASE  WHEN @EntitiyIds = '0' AND TC.CompanyId = CT.Id THEN 1
                              WHEN @EntitiyIds <> '0' AND TC.CompanyId = (SELECT Item FROM dbo.Split(@EntitiyIds, ',')) THEN 1 END = 1

dbo.Split返回包含逗号分隔值的表

请帮助

Answer 1

也许这样的事情。

{{1}}

Answer 2

从您提供的错误消息中，您的子查询似乎返回了多行。您最后一个查询细分的最后一行似乎有问题：

DECLARE @EntitiyIds  AS VARCHAR(2500) = '101'

SELECT * FROM Tb_CompanyType CT
INNER JOIN Tb_Company TC ON 
                        CASE  WHEN @EntitiyIds = '0' AND TC.CompanyId = CT.Id THEN 1
                              WHEN @EntitiyIds <> '0' AND TC.CompanyId = (SELECT Item FROM dbo.Split(@EntitiyIds, ',')) THEN 1 END = 1

更改最后一个

SELECT Item FROM dbo.Split(@EntitiyIds, ',')

到

SELECT top 1 Item FROM dbo.Split(@EntitiyIds, ',')

如何在选定值的基础上写出条件

2 个答案: