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01.22.2008 at 07:51PM PST, ID: 23103370
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6.4

LinQ INNER JOIN AND LEFT JOIN in same query ... How To?

Asked by remi_106 in Language Integrated Query - LINQ, Microsoft Visual Basic.Net, .Net Editors & IDEs

Tags: ,

I would like to know how to convert this SQL Query into a LinQ equivalent:

SELECT nContractDeliverables.* FROM (nContractDeliverables  INNER(Join) nContractPaymentLines ON (nContractDeliverables.DeliverableNo = nContractPaymentLines.DeliverableNo) AND  (nContractDeliverables.[MR No] = nContractPaymentLines.[Mr No]))  LEFT JOIN  nFacilityDeliverables ON (nContractDeliverables.DeliverableNo = nFacilityDeliverables.DeliverableNo) AND  (nContractDeliverables.[MR No] = nFacilityDeliverables.[MR No])  WHERE (((nFacilityDeliverables.Facility) Is Null)) and nContractDeliverables.[mr no] = " & ntq(ContractNo) & " and not nz(AdditionalWorkFlag)  Order by nContractDeliverables.[Mr no], nContractDeliverables.DeliverableNo;")


I know to do standard Joins ... but this one baffles me ...

This is what I've written so far, but I'm not sure if it is correct ...

Dim rsContractDeliverables = From cd In dc2.nContractDeliverables Join _
fd In dc.nFacilityDeliverables On cd.DeliverableNo Equals fd.DeliverableNo And _
fd.MR_No Equals cd.MR_No Group Join _
pl In dc3.nContractPaymentLines On cd.DeliverableNo Equals pl.DeliverableNo And _
cd.MR_No Equals pl.Mr_No Into Group Where _
((fd.Facility Is Nothing) And cd.MR_No = ntq(pContractNumber) And cd.AdditionalWorkFlag <> Nothing) Order By _
cd.MR_No, cd.DeliverableNo

I'm basing the above work on an article where "Group Join" seems to be used to translate LEFT JOINS.
See: http://news.speeple.com/msdn.com/2007/12/31/converting-sql-to-linq-part-6-joins-bill-horst.htm

PS: Disregard ntq functions ... Start Free Trial
 
 
[+][-]02.24.2008 at 08:51PM PST, ID: 20972996

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Zones: Language Integrated Query - LINQ, Microsoft Visual Basic.Net, .Net Editors & IDEs
Tags: ASP.NET, LinQ, Internet Explorer
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Solution Provided By: jdraggi
Participating Experts: 1
Solution Grade: C
 
 
[+][-]02.24.2008 at 08:56PM PST, ID: 20973015

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