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04/29/2004 at 12:15PM PDT, ID: 20972716
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8.6

Correlated Subquery

Asked by Joe_Griffith in Databases Miscellaneous

Tags: correlated, subquery

I need to use a correlated subquery with alieases.  I have been able to make it work when the FROM clauses are simple tables.  I can't make it work when the FROM clauses are joins:

What I want to do is something like this:
SELECT Py.PayDate, PyDed.IdCoDed, PyDed.Pot, PyDed.Amount, PyDed.Flags
FROM (Py INNER JOIN (CoDed INNER JOIN PyDed ON CoDed.Id=PyDed.IdCoDed) ON Py.Id=PyDed.IdPy)
WHERE (Py.Status = 1)
AND (Py.PayDate BETWEEN #1/1/2004# AND #3/31/2004#)
AND ((CoDed.EmCo = 2) OR (CoDed.TaxDed = 2))  
AND (Py.IdEm = 1)
AND EXISTS (SELECT * FROM (Py INNER JOIN (CoDed INNER JOIN PyDed ON CoDed.Id=PyDed.IdCoDed) ON Py.Id=PyDed.IdPy)
WHERE PyDed.Id = 36
AND T1.PayDate=T2.PayDate

Notice that the FROM clauses are identical in both the main and subquery.  The part I can't get right are the aliases T1 and T1.  When the FROM clauses are just tables I can do this:
FROM Py T1
To assign T1 as the alias for Py in the main clause.  

Is there a way to assign an alias for a table that is part of a join and then use it in the subquery?

[+][-]04/29/04 12:59 PM, ID: 10953283

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[+][-]04/29/04 01:17 PM, ID: 10953426

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[+][-]04/29/04 01:37 PM, ID: 10953625

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About this solution

Zone: Databases Miscellaneous
Tags: correlated, subquery
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Solution Provided By: geotiger
Participating Experts: 2
Solution Grade: A
 
 
[+][-]04/29/04 01:38 PM, ID: 10953633

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[+][-]04/29/04 01:52 PM, ID: 10953732

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