SQL where clause in nested query with column that doesnt exist in nested query - sql

Question

I wrote the following query and it works:
select * from processed p
inner join data d on d.dataId = p.dataid
where assetid in (select a.assetid from dbo.file f
inner join asset a on a.assetName = f.fileNumber
inner join configMapping c on c.assetId = a.assetid
WHERE p.id in (2,11) and rawConfig = 1)
However, I realised this shouldn't work. The query should be written as:
select * from processed p
inner join data d on d.dataId = p.dataid
where assetid in (select a.assetid from dbo.file f
inner join asset a on a.assetName = f.fileNumber
inner join configMapping c on c.assetId = a.assetid
WHERE rawConfig = 1)
and p.id in (2,11)
The nested query is only looking for assetid's. Furthermore, running the nested query on its own wouldn't work because id isn't in those three tables:
select a.assetid from dbo.file f
inner join asset a on a.assetName = f.fileNumber
inner join configMapping c on c.assetId = a.assetid
WHERE p.id in (2,11) and rawConfig = 1
Msg 207, Level 16, State 1, Line 44
Invalid column name 'id'.
Apologies for not having testable data to provide, but essentially the question is how does the first query's nested query use a where on a column from its parent query. Logically I would think the nested query would fail and thus the whole query should fail.
I'm using the newest version of SSMS

Answer 1

You have to add condition in the select using case I have shifted the ContractDate but if it doesn't work then you have to shift other conditions too
Select
SUM(case when c.ContractDate >= #ContractDate then c.Price else 0 end) As 'TotalPrice',
SUM(case when c.ContractDate >= #ContractDate then 1 else 0 end) As 'ContractCount'
from Rsv_Contract as c
where c.RegisterUsersId = #RegisterUsersId
and c.contractstate in (1,2)
and c.ContractNumber!='0000000'
and c.ContractNumber!='-1'
Group by CAST(c.ContractDate AS DATE)

Answer 2

You can use EXISTS clause of sql.
select *
from processed p
join data d
on d.dataid = p.dataid
where p.id in (2, 11)
and exists (select 1
from dbo.file f
join asset a
on a.assetname = f.filenumber
join configmapping c
on c.assetid = a.assetid
where a.assetid = p.asset_id
and rawconfig = 1)
Sorry guys, my bad not mentioning the code beforehand.
Hope this will solve your problem.

Answer 3

I found the answer here:
https://learn.microsoft.com/en-us/sql/relational-databases/performance/subqueries?view=sql-server-2017
Important
If a column is referenced in a subquery that does not exist in the table referenced by the subquery's FROM clause, but exists in a table referenced by the outer query's FROM clause, the query executes without error. SQL Server implicitly qualifies the column in the subquery with the table name in the outer query.
It will effectively refactor the query into a series of joins before executing.