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BOOK: SQL Functions Programmer's Reference
This is the forum to discuss the Wrox book SQL Functions Programmer's Reference by Arie Jones, Ryan K. Stephens, Ronald R. Plew, Robert F. Garrett, Alex Kriegel; ISBN: 9780764569012
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Old June 10th, 2011, 07:48 PM
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Thumbs up Logic for correlated subquery

hi i want to know the logic of this query..i mean how data flows.....
i want to know what do the
where subtotal <=
please help me to understand this with the help of dfd if necessary

USE AdventureWorks
SELECT TerritoryID, SubTotal, SalesPersonID, SalesOrderID
FROM Sales.SalesOrderHeader AS SO1
WHERE SubTotal <= (SELECT MAX(SO2.SUBTOTAL) FROM Sales.SalesOrderHeader AS SO2
WHERE SO1.TerritoryID = SO2.TerritoryID
AND SO1.SubTotal < = SO2.SubTotal
HAVING COUNT(SubTotal) <= 5)
ORDER BY TerritoryID,SubTotal DESC;

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