Question : Select Missing Rows From Table (Determination Made Based on Multiple Columns)

Greetings, I need some expert help.  I have two tables and I need to find rows in table #1 that are missing in table #2.  To determine what is "Missing" I need to search multiple columns.  Here is an Example of my table structure:

Table_1
--------------------
Table_1_Unique_ID  (int)
PIN (varchar(6))
AIN (varchar(9))
TypeID (int)

Table_2
--------------------
Table_2_Unique_ID (int)
PIN (varchar(6))
AIN (varchar(9))
TypeID (int)


Since Table_2 doesn't have Table_1_Unique_ID as a foreign key, I guess I need to make the mix of PIN/AIN/TypeID act like the key in order to find rows that are missing from Table_2... I just don't know how to do that.

Thank you in advance for your help!

Answer : Select Missing Rows From Table (Determination Made Based on Multiple Columns)

This should help:

select t1.*
FROM Table_1 t1 LEFT OUTER JOIN Table_2 t2
ON t1.PIN = t2.PIN
AND t1.AIN = t2.AIN
AND t1.TypeID = t2.TypeID
WHERE t2.Table_2_Unique_ID is NULL