invalid column name in HAVING [duplicate] - sql

Question

This question already has answers here:
Why can't I use an alias for an aggregate in a having clause?
(8 answers)
Closed 4 years ago.
Anyone have an idea why the 'CoID' value isnt recognized?
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
Error:
Invalid column name 'CoID'.

Answer 1

If, you want to filter the single record then use where clause instead of 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
However, having is used when you want to filter out after some aggregation or filter out based on aggregation or withing the aggregation
So. your query will look like with having clause :
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

In logical query processing SELECT is executed after HAVING or WHERE clause clause. therefore it is not able to recognize column name created in SELECT. Try using max(a.CompanyID) instead:
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

You are missing the group by clause, which you obviously want since you are using aggregation functions. I assume from your select what you want is:
group by ac.AccountID
Afterwards, are you trying to take only CompanyIDs of 1506, or you want to only show grouping results for which max is 1506: The first is done like this:
Where a.CompanyID = 1506
the second like this
having max(a.CompanyID)=1506