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Possible Join of One Table Field to Two Master Table Fields?


Possible Join of One Table Field to Two Master Table Fields?

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liam.bell
liam.bell
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Group: General Forum Members
Points: 15 Visits: 19
Came across a small problem.
I have a master table that contains a record of each member. In this talbe there are two fields; "HomeState", and "WorkState". Both of these fields have a Int value representing the ID value of the corresponding state in the States table.

I'm trying to pull back the data as such:

Member, HomeState, WorkState
Joe.Smoe, TX, AZ
Jane.Doe, VA, DC


What sort of JOIN would one use to accomplish this? Is it even possible?



Cheers.
ChrisM@Work
ChrisM@Work
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Group: General Forum Members
Points: 41481 Visits: 20005
Liam, you need to join the states table twice:

SELECT m.member, h.HomeState, m.WorkState 
FROM master m
LEFT JOIN States h ON h.[ID] = m.HomeState
LEFT JOIN States w ON w.[ID] = m.WorkState



Cheers

ChrisM

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
liam.bell
liam.bell
Grasshopper
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Group: General Forum Members
Points: 15 Visits: 19
You're a champion, Chris!

Thank you very much! BigGrin
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