转换失败将varchar转换为Int - 使用Concat

Question

我试图将两个字段连接成一个，第一个是varchar，第二个是int。我收到了“将数据类型varchar转换为数据类型为int的转换失败”错误，并且我不熟悉sql需要自己解决这个问题的原因。

的代码如下：

CONCAT（polpolicynumber， ' - '，转换（VARCHAR（10），poltermsequence））作为REFVALUE

我也不知道为什么它试图将其转换到一个int。保持它作为一个varchar是我想要的。

任何帮助将不胜感激。

非常感谢！

下面是情况下，整个代码，可以帮助：

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

错误似乎并不被从concat，但是当你使用union那里。您在第一个查询（我假设是INT），agtid as RefValue在第二个查询（我也假定是INT）中有agcid as RefValue。

然后你在最后一个查询中有concat(polpolicynumber, ' ', 'Term', ' ', convert(nvarchar(10),poltermsequence)) as RefValue，这显然是VARCHAR，并且不能直接用前面的列编辑UNION。