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Linq to SQL query
Posted on 2011-03-10
Hello, could someone help me with the below.
I would like to select all records in the email table when it exists in the customer and preferences table (left outer join?). This must return distinct records and in the form of list(of Emails).
Thanks!
I would like to select all records in the email table when it exists in the customer and preferences table (left outer join?). This must return distinct records and in the form of list(of Emails).
Dim q = From e In db.Emails
Join c In db.Customers On e.email Equals c.EmailAddress
Join p In db.Preferences On c.CustID Equals c.CustID
Where p.condition = True
'where do I go from here? Then the list should be returned.
dim emaillist as new list(of Emails)
emailliist = q.tolist
return emaillist
Thanks!
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If I understand correctly, the default in Linq is an inner join, so you should implicitly get the rows that exist in all three tables if you join them all up. As for the distinct part, try this mod:
Dim q = From e In db.Emails
Join c In db.Customers On e.email Equals c.EmailAddress
Join p In db.Preferences On c.CustID Equals c.CustID
Where p.condition = True
return q.Distinct().ToList()
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