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Join on the same table different column

Posted on 2012-03-25
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Last Modified: 2012-03-25
Is it possible to JOIN on the same table, but different column in the same query?

SELECT Table1.Name, Table2.FirstName
FROM Table1
INNER JOIN Table2
ON Table1.Table1ID = Table2.FirstID
INNER JOIN Table2
ON Table1.Table1ID = Table2.SecondID

I know the above scenario doesn't work, so how could I JOIN on the same table different column?
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Question by:mitdaniels
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4 Comments
 
LVL 75

Expert Comment

by:Aneesh Retnakaran
ID: 37764133
use a LEFT JOIN

SELECT Table1.Name, Table2.FirstName
FROM Table1
INNER JOIN Table2
ON Table1.Table1ID = Table2.FirstID
LEFT JOIN Table2
ON Table1.Table1ID = Table2.SecondID
0
 

Author Comment

by:mitdaniels
ID: 37764219
Thanks aneeshattingal.

I gave it a go, but get this error message:

"Msg 1013, Level 16, State 1, Line 1
The objects "Table2" and "Table2" in the FROM clause have the same exposed names. Use correlation names to distinguish them."
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LVL 75

Accepted Solution

by:
Aneesh Retnakaran earned 1000 total points
ID: 37764272
SELECT Table1.Name, Table2.FirstName
FROM Table1
INNER JOIN Table2  
ON Table1.Table1ID = Table2.FirstID
LEFT JOIN Table2 t
ON Table1.Table1ID = t.SecondID
0
 

Author Closing Comment

by:mitdaniels
ID: 37764287
The concept works thanks!!
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