Question

我正在尝试将两个字段连接成一个，第一个是varchar，第二个是int。我在将数据类型varchar转换为数据类型int时出现“转换失败”错误，而且我对sql不熟悉，无法自行解决为什么会这样。

代码如下：

concat（polpolicynumber，' - '，convert（varchar（10），poltermsequence））为RefValue

我也不确定为什么它会尝试将其转换为int。保持它作为varchar是我想要的。

任何帮助都将非常感激。

非常感谢！

以下是有帮助的整个代码：

declare @rundate date = '10-02-2015'
select @rundate as RunDate, 'FINYS' as Source, 'Agency' as ReferenceTable, 'AgcID' as RefID, agcid as RefValue, 
agcname as LastName, '' as MiddleName, '' as FirstName
from COHPROD_Policy..agency
where AgcExpirationDate is NULL or agcexpirationdate > @rundate
union
select @rundate as RunDate, 'FINYS' as Source, 'Agent' as ReferenceTable, 'AgtID' as RefID, agtid as RefValue, 
agtname as LastName, '' as MiddleName, '' as FirstName
from COHPROD_Policy..agent
where AgtTerminationDate is NULL or AgtTerminationDate > @rundate
union
select @rundate as RunDate, 'FINYS' as Source, 'Policy' as ReferenceTable, 'PolNumber' as RefID, 
concat(polpolicynumber, ' ', 'Term', ' ', convert(nvarchar(10),poltermsequence)) as RefValue, 
isnull(connamelast,'') as LastName, isnull(connamemiddle,'') as MiddleName, isnull(connamefirst,'') as FirstName
from COHPROD_Policy..policy p
join COHPROD_Policy..ContactXref cox on coxpolid = polid
join COHPROD_Policy..Contact con on conid = coxconid
join cohprod_policy..policystatus on pospolid = polid
where pospolicystatus = 'active'

Answer 1

错误似乎不是来自concat，而是来自union。您在第一个查询中有agcid as RefValue（我假设是INT），第二个查询中有agtid as RefValue（我还假设是INT）。

然后您在上一个查询中有concat(polpolicynumber, ' ', 'Term', ' ', convert(nvarchar(10),poltermsequence)) as RefValue，显然是VARCHAR，不能直接使用之前的列进行UNION。

转换失败将varchar转换为Int - 使用Concat

1 个答案: