SELECT FirstName
FROM Adjuncts
INNER JOIN Faculty ON Adjuncts.FirstName = Faculty.FirstName
This is my Microsoft SQL Server 2012 code. I am trying to join two tables together ( Adjuncts
and Faculty
) and share their FirstName
, and LastName
columns. I tried to just do one ( FirstName
) to see if I could make it work, and could not. I was receiving the following error message:
Msg 209, Level 16, State 1, Line 1
Ambiguous column name 'FirstName'
Is anyone able to tell me how to properly join the two tables together? And how to show ONLY the 'FirstName' & 'LastName' columns which are defined in each of the tables WITHOUT overlapping the 'FirstName' & 'LastName' columns and having them twice.
Both tables have FirstName
in them -- as clearly shown by the ON
clause.
I would recommend that you use table aliases for your qualified column names:
SELECT a.FirstName
FROM Adjuncts a INNER JOIN
Faculty f
ON a.FirstName = f.FirstName;
Both tables in your query ( Adjuncts
and Faculty
) have a FirstName
column, so you have to fully qualify it. Eg:
SELECT Adjuncts.FirstName
-- Here ---^
FROM Adjuncts
INNER JOIN Faculty ON Adjuncts.FirstName = Faculty.FirstName
Try using the following query, this might have a match so there will be data presented. It is really difficult to have a match when you are not using key columns in the ON
clause of JOIN
SELECT a.firstname
FROM adjuncts a
JOIN faculty f
ON UPPER(a.firstname) = UPPER(f.firstname)
Also, do not add f.firstname in the SELECT
clause if you do not want to have two different columns for firstname.
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