ADO.NET :: Implement DAL For Cross Tables (e.g. Northwind Orders & OrderDetails)?

Oct 6, 2010

Microsoft has two very helpful articles on DAL (Creating a Data Access Layer) &

BLL (Creating a Business Logic Layer) but they are Incomplete as the does not cover all the Tables.

The most Important tables in Northwind db are Orders & OrderDetails. Both the articles have nothing about them.

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TABLE 1
SELECT I.STUNA
,S.SNO
,SUM(B.AMT * Y.YEAR) AS AMT
FROM STUDENT S
LEFT JOIN INFO I ON S.SNO = I.SNO
LEFT JOIN BONUS B ON S.SNO = B.SSNO
LEFT JOIN YEAR Y ON S.SNO = Y.SSNO
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LISA B 20
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TABLE 2
SNO AMT
A 1
B 2
C 3
D 5

I WANT TO HAVE RESULT LIKE THIS (TABLE1 + TABLE2)

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JOHN A 11
LISA B 22
ALLEN C 103
EDDIE D 5

I TRIED USE THIS QEURY

SELECT I.STUNA
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FROM STUDENT S
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LEFT JOIN BONUS B ON S.SNO = B.SSNO
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(
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JOHN A 11
LISA B 22
ALLEN C 103

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[Code]....

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[Code]....

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