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Insert Into for New Data Only

Posted on 2013-05-20
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Last Modified: 2013-12-16
I have a table (tbl1) with 8 rows of data for Agents and their Sales
A - 3
B - 6
C - 12
D - 7
E - 8
F - 9
G - 10
H - 22

I want to insert data into a second table (tbl2), but only new data. So if tbl2 currently has Agents and Sales in it for Agents A & B, when I perform an insert I only want data for Agents C, D, E, F, and G to go into tbl2. Thus the data already in tbl2 for Agents A & B does NOT change.
I am not writing the correct Insert statement or Update, need help. Thanks
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Question by:SeTech
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4 Comments
 
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Kent Fichtner earned 500 total points
ID: 39181386
how are you going to be doing this insert?  is it going to be based on a trigger, or is it a one time thing that you are writing a query for?

you could try something like:

Update TBL2
SET <column> = <data here>
WHERE AGENT NOT IN (SELECT AGENT FROM TBL1)
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Author Comment

by:SeTech
ID: 39181404
I will send the new data weekly, but how could you do an update when the data is NOT yet in tbl2?
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Expert Comment

by:Kent Fichtner
ID: 39181429
I guess I am not quite understanding what you are looking to do.  Where are you getting the data for tbl2?  How are you going to be inserting it (through a stored procedure)?  As long as tbl2 has a column for agent, the were clause above should still be valid.  In the case of the first insert it would find no agents on tbl2 the same as tbl1 and would insert everything.
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Expert Comment

by:Kevin Cross
ID: 39181482
You would use NOT EXISTS.

INSERT INTO tbl2(col1, col2)
SELECT col1, col2
FROM tbl1
WHERE NOT EXISTS (
    SELECT 1
    FROM tbl2
    WHERE tbl2.col1 = tbl1.col1
)
;

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Just adjust the WHERE clause of the subquery to be the correct columns that match an existing record in tbl2.
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