SQL Server - use columns from the main query in the subquery - sql

Question

Is there any way to get a column in real time, from a main query, and use it in a subquery?
Something like this: (Use A.item in the subquery)
SELECT item1, *
FROM TableA A
INNER JOIN
(
select *
from TableB B
where A.item = B.item
) on A.x = B.x;
Ok, here is the real thing:
I need to modify this existing query. It worked before, but now that the database changed, I need to do some modifications, add some comparisons. As you can see there are a lot of JOINS, and one of them is a subquery. I need to add a comparison from a column from the main query (from the table T0 for example) to the subquery (like this: T6.UnionAll_Empresa = T0.UnionALl_Empresa)
Select T0.UnionAll_Empresa,<STUFF>
from [UNION_ALL_BASES]..OINV T0 with (nolock)
inner join [UNION_ALL_BASES]..INV6 T1 with (nolock) on t0.DocEntry = t1.DocEntry and t0.UnionAll_Empresa = t1.UnionAll_Empresa
inner join
(
select
t1.CompanyID,
T2.CompanyDb,
t1.OurNumber,
T6.BankCode,
T6.BankName,
T3.[Description] Situation,
T1.[Status],
T5.Descrption nomeStatus,
T1.Origin,
T1.DocEntry,
T1.DocType,
T1.ControlKey,
T1.CardCode,
T4.[Description] ContractBank,
T1.PayMethodCode,
T1.DueDate,
T1.DocDate,
T1.InstallmentID,
T1.InstallmentValue,
T1.Correction,
T1.InterestContractural,
T1.FineContract,
T1.ValueAbatment,
T1.ValueDiscount,
T1.ValueFineLate,
T1.ValueInterestDaysOfLate,
T1.OtherIncreases,
T1.ValueInWords,
T1.ValueDocument,
T1.DigitalLine,
T1.Document
from [IntegrationBank]..BillOfExchange T1 with (nolock)
inner join [InterCompany2]..CompanyHierarchy T2 with (nolock) on T1.CompanyID = T2.ID
left join [IntegrationBank]..BillOfExchangeSituation T3 with (nolock) on T1.Situation = T3.ID
inner join [IntegrationBank]..ContractBank T4 with (nolock) on T1.ContractBank = T4.ID
inner join [IntegrationBank]..BoeStatus T5 with (nolock) on T1.[Status] = T5.ID
inner join [UNION_ALL_BASES]..ODSC T6 with (nolock) on T4.BankKey = T6.AbsEntry and **T6.UnionAll_Empresa = T0.UnionALl_Empresa** --I need to do this
where T1.[Status] <> 5
and T2.CompanyDb = **T0.UnionAll_Empresa** --I need to do this
) TBI on (T1.DocEntry = TBI.DocEntry and T1.InstlmntID = TBI.InstallmentID and TBI.DocType = T1.ObjType )
inner join [UNION_ALL_BASES]..OCTG T2 on T0.GroupNum = T2.GroupNum and T0.UnionAll_Empresa = T2.UnionAll_Empresa
inner join [UNION_ALL_BASES]..OSLP T3 on T0.SlpCode = T3.SlpCode and T0.UnionAll_Empresa = T3.UnionAll_Empresa
where not exists (select 1
from [UNION_ALL_BASES]..RIN1 A with (nolock)
inner join [UNION_ALL_BASES]..ORIN B with (nolock) on A.DocEntry = B.DocEntry and A.UnionAll_Empresa = B.UnionAll_Empresa
where A.BaseEntry = T0.DocEntry
and B.SeqCode = ''1'' )

Answer 1

You can user OUTER APPLY
SELECT *
FROM tbl1
OUTER APPLY ( SELECT TOP 1
currency_id,
SUM(taxrate) AS taxrate
FROM tbl2
WHERE wuptr.currency_id = tbl1.currency_id
GROUP BY tbl2.currencyid
)

Answer 2

You don't need a subquery for that:
SELECT item1, *
FROM TableA A
INNER JOIN
TableB B
ON A.item = B.item
AND A.x = B.x;
I can't think of a scenario where you would need to JOIN on a subquery with a filter like that where it wouldn't be equivalent to just reference the field directly in the outer query.
You can reference the outer table in the subquery in the WHERE clause, though:
SELECT <stuff>
FROM Table t
WHERE EXISTS (SELECT 1 from TableB B
WHERE t.id = b.id)
EDIT
For your actual code, just change the JOIN criteria to this:
) TBI on (T1.DocEntry = TBI.DocEntry
and T1.InstlmntID = TBI.InstallmentID
and TBI.DocType = T1.ObjType
AND TBI.CompanyDB = T0.UnionAll_Empresa )

Answer 3

If you want to join on to a subquery and "get a column in real-time"/ reference a column from the main query, then there is a trick to doing this.
You can't access the tables which are outside of the subquery if it's used as an aliased table, in other words, this SQL can never access A:
...
INNER JOIN
(
select *
from TableB B
where A.item = B.item
) on A.x = B.x;
The way to access A would be like this:
SELECT item1, *
FROM TableA A
INNER JOIN TableB on TableB.item = TableA.item and TableB.item in
(
select top 1 B.Item
from TableB B
where A.item = B.item
)
Just ignore the "top 1" piece, I just added that to show that there may a reason for doing a join like this.
So, basically if you want to reference an item from the query in the subquery, just move the subquery to the ON section of a join and use the IN keyword as illustrated above.

Answer 4

You can do this by naming the tables of the main query and the nested query.
For example:
SELECT continent, name, population FROM world x
WHERE population >= ALL
(SELECT population FROM world y
WHERE y.continent=x.continent
AND population>0)
reference: http://sqlzoo.net/wiki/SELECT_within_SELECT_Tutorial

Answer 5

Not sure why people are over-complicating this. #JNK is correct that you can move the predicate into the main query. For completeness, I will demonstrate.
You have two predicates in your subquery that reference T0:
T6.UnionAll_Empresa = T0.UnionAll_Empresa
T2.CompanyDb = T0.UnionAll_Empresa
The first is an INNER JOIN predicate on the table T6, and the second a WHERE clause - these are both "hard" filters, and will filter out results that don't match (unlike a LEFT OUTER JOIN which will simply set reference to that table's values to NULL).
Well, since T6.UnionAll_Empresa and T2.CompanyDb both need to filter against T0.UnionAll_Empresa, then we can simply change the INNER JOIN predicate on T6 to this:
T2.CompanyDb = T6.UnionAll_Empresa
Then, we can remove the WHERE clause in the subquery, and we can add this JOIN predicate to TBI in the main query:
TBI.CompanyDb = T0.UnionAll_Empresa
...making the entire query this:
Select T0.UnionAll_Empresa,<STUFF>
from [UNION_ALL_BASES]..OINV T0 with (nolock)
inner join [UNION_ALL_BASES]..INV6 T1 with (nolock) on t0.DocEntry = t1.DocEntry and t0.UnionAll_Empresa = t1.UnionAll_Empresa
inner join
(
select
t1.CompanyID,
T2.CompanyDb,
t1.OurNumber,
T6.BankCode,
T6.BankName,
T3.[Description] Situation,
T1.[Status],
T5.Descrption nomeStatus,
T1.Origin,
T1.DocEntry,
T1.DocType,
T1.ControlKey,
T1.CardCode,
T4.[Description] ContractBank,
T1.PayMethodCode,
T1.DueDate,
T1.DocDate,
T1.InstallmentID,
T1.InstallmentValue,
T1.Correction,
T1.InterestContractural,
T1.FineContract,
T1.ValueAbatment,
T1.ValueDiscount,
T1.ValueFineLate,
T1.ValueInterestDaysOfLate,
T1.OtherIncreases,
T1.ValueInWords,
T1.ValueDocument,
T1.DigitalLine,
T1.Document
from [IntegrationBank]..BillOfExchange T1 with (nolock)
inner join [InterCompany2]..CompanyHierarchy T2 with (nolock) on T1.CompanyID = T2.ID
left join [IntegrationBank]..BillOfExchangeSituation T3 with (nolock) on T1.Situation = T3.ID
inner join [IntegrationBank]..ContractBank T4 with (nolock) on T1.ContractBank = T4.ID
inner join [IntegrationBank]..BoeStatus T5 with (nolock) on T1.[Status] = T5.ID
inner join [UNION_ALL_BASES]..ODSC T6 with (nolock) on T4.BankKey = T6.AbsEntry and T2.CompanyDb = T6.UnionAll_Empresa
where T1.[Status] <> 5
) TBI on (T1.DocEntry = TBI.DocEntry and T1.InstlmntID = TBI.InstallmentID and TBI.DocType = T1.ObjType and TBI.CompanyDb = T0.UnionAll_Empresa)
inner join [UNION_ALL_BASES]..OCTG T2 on T0.GroupNum = T2.GroupNum and T0.UnionAll_Empresa = T2.UnionAll_Empresa
inner join [UNION_ALL_BASES]..OSLP T3 on T0.SlpCode = T3.SlpCode and T0.UnionAll_Empresa = T3.UnionAll_Empresa
where not exists (
select 1
from [UNION_ALL_BASES]..RIN1 A with (nolock)
inner join [UNION_ALL_BASES]..ORIN B with (nolock) on A.DocEntry = B.DocEntry and A.UnionAll_Empresa = B.UnionAll_Empresa
where A.BaseEntry = T0.DocEntry
and B.SeqCode = ''1''
)
This is entirely equivalent to what you have, and removes any reference to T0 from your subquery.

Answer 6

You can also use WITH
http://msdn.microsoft.com/en-us/library/ms175972.aspx