Question

任何人都知道为什么“CoID”值无法识别？

select 
    ac.AccountID
    , max(case when c.Name = 'email' then c.Data end) as Email
    , max(case when c.Name = 'phone' then c.Data end) as Phone
    , max(a.CompanyID) as CoID
from paul_AccountContacts ac
left join paul_Contact c on c.ID = ac.ContactID 
left join paul_Account a on a.ID = ac.AccountID
having (CoID in (1506))                  --ERROR HERE
order by ac.AccountID

错误：

无效的列名称'CoID'。

Answer 1

如果您要过滤单个记录，请使用where子句代替having

select 
      ac.AccountID,
      max(case when c.Name = 'email' then c.Data end) as Email,
      max(case when c.Name = 'phone' then c.Data end) as Phone,
      max(a.CompanyID) as CoID
from paul_AccountContacts ac
left join paul_Contact c on c.ID = ac.ContactID 
left join paul_Account a on a.ID = ac.AccountID
group by ac.AccountID
where a.CompanyID  = 1506 -- use IN clause whenever you have multiple CompanyID ids
order by ac.AccountID

但是，如果您希望在某些聚合之后过滤掉或基于聚合过滤掉或使用聚合having em>

因此。您的查询将与having子句一样：

select ac.AccountID, max(case when c.Name = 'email' then c.Data end) as Email, max(case when c.Name = 'phone' then c.Data end) as Phone, max(a.CompanyID) as CoID from paul_AccountContacts ac left join paul_Contact c on c.ID = ac.ContactID left join paul_Account a on a.ID = ac.AccountID group by ac.AccountID having max(a.CompanyID) = 1506 order by ac.AccountID;

Answer 2

在逻辑查询处理SELECT在HAVING或WHERE子句后执行。因此，它无法识别SELECT中创建的列名称。请尝试使用max(a.CompanyID)：

    select 
        ac.AccountID
        , max(case when c.Name = 'email' then c.Data end) as Email
        , max(case when c.Name = 'phone' then c.Data end) as Phone
        , max(a.CompanyID) as CoID
    from paul_AccountContacts ac
    left join paul_Contact c on c.ID = ac.ContactID 
    left join paul_Account a on a.ID = ac.AccountID
    Group by ac.AccountID
    having max(a.CompanyID)  = 1506                  --ERROR HERE
    order by ac.AccountID

Answer 3

您缺少group by子句，您显然想要使用聚合函数。我假设您选择的是：

group by ac.AccountID

之后，您是否只尝试使用1506的CompanyID，或者您只想显示最大值为1506的分组结果：第一个是这样的：

Where a.CompanyID  = 1506

第二个像这样

having max(a.CompanyID)=1506

HAVING中的列名无效

3 个答案: