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SQL syntax - multiple joins

Posted on 2013-11-18
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Last Modified: 2013-11-19
Hi,

I have a query with an inner join pulling data from two tables. One of the tables has several fields containing User IDs. This is a job table, so there is createdbyuserID, assignedtoUserID, etc. I'd like to append the existing query to pull in the names of these folks from the Users table, but I'm not sure how I would join the same table twice or even 4 times to pull names from the same set of user records.

My current query like so:

SELECT Customers.CustomerID, Customers.CustomerFirstName, Customers.CustomerLastName, Customers.CustomerEmail, Customers.CustomerPhoneCell, Customers.CustomerPhoneHome, Customers.OKContactLater, Jobs.JobAddress1, Jobs.JobAddress2, Jobs.JobCity, Jobs.JobState, Jobs.JobZipCode, Jobs.AcceptedPrice, Jobs.PaintStartDate, Jobs.PaintEndDate FROM Customers INNER JOIN Jobs ON Customers.CustomerID = Jobs.CustomerID WHERE PaintEndDate between 1/1/2013 and 12/31/2013

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If I wanted to key on Jobs.CreatedByID to pull in Users.FirstName and Users.LastName and return that, then use Jobs.AssignedToID to pull in Users.FirstName and Users.LastName for that second different ID, how would I wrap my joins?

Thank you

Bill
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Question by:billium99
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2 Comments
 
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Steve Wales earned 2000 total points
ID: 39657906
Join the query to the Users Table twice - aliasing it the first time as Users1 and the second time as Users2:

SELECT Customers.CustomerID, Customers.CustomerFirstName, Customers.CustomerLastName, Customers.CustomerEmail, Customers.CustomerPhoneCell, Customers.CustomerPhoneHome, Customers.OKContactLater, Jobs.JobAddress1, Jobs.JobAddress2, Jobs.JobCity, Jobs.JobState, Jobs.JobZipCode, Jobs.AcceptedPrice, Jobs.PaintStartDate, Jobs.PaintEndDate, Jobs.CreatedbyID, Users1.First_name, Users2.LastName, Jobs.AssignedToID, Users2.FirstName, Users2.LastName
FROM Customers 
INNER JOIN Jobs ON Customers.CustomerID = Jobs.CustomerID 
INNER JOIN Users Users1 on Jobs.CreatedByID = Users1.UserID
INNER JOIN Users Users2 on Jobs.AssignedToID = Users2.UserID
WHERE PaintEndDate between 1/1/2013 and 12/31/2013

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Author Closing Comment

by:billium99
ID: 39659512
Perfect - thx!
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