Question

我基本上试图将查询的输出存储在变量中，但是收到错误消息

子查询返回的值超过1。当子查询遵循=，！=，＆lt;，＆lt; =，＆gt;，＆gt; =或子查询用作表达式时，不允许这样做。

--DECLARE @companystring varchar(max)= '867343,867358,867443,867458,867543'

    DECLARE @companystring varchar(max)
    set @companystring = (SELECT DISTINCT Top 1000(mc.companyId) FROM ciqMarketCap mc 
    JOIN ciqCompany c   ON c.companyid = mc.companyid
    WHERE c.companyStatusTypeId NOT IN (5,6) AND  c.companyTypeId IN (1,4))


    select 
            ci.id
        into #companyId
        from dbo.splitstring(@companystring) ci

有人可以告诉我这是什么问题吗？

Answer 1

如果我理解你正确而你需要将列数据转换为字符串，则可以使用下一个查询 -

DECLARE @companystring nvarchar(max)

SELECT TOP 1000 @companystring = coalesce(@companystring+';','') + CAST( mc.companyId AS nvarchar)
FROM ciqMarketCap mc 
JOIN ciqCompany c   ON c.companyid = mc.companyid
WHERE c.companyStatusTypeId NOT IN (5,6) AND  c.companyTypeId IN (1,4)

SELECT @companystring

Answer 2

首先，将大型数据集存储到nvarchar / varchar变量中并不理想。适当的步骤是创建临时表变量。请参阅下面的编辑查询：

DECLARE @companystring TABLE(companyId nvarchar(max));

INSERT INTO @companystring(companyId)
SELECT 
 DISTINCT Top 1000(mc.companyId) 
FROM ciqMarketCap mc 
JOIN ciqCompany c ON c.companyid = mc.companyid
WHERE c.companyStatusTypeId NOT IN (5,6) 
AND c.companyTypeId IN (1,4);

select ci.companyId into #companyId from @companystring ci;

无法在变量中捕获查询的输出

2 个答案: