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Reverse of inner join query

Posted on 2004-04-07
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Last Modified: 2008-03-17
The query below does a match between 2 tables and returns 4,100 records. I would now like to run a query that returns the gap which is 472 records (the unmatched records not returned from the HR_CTI table). Basically, I need to inverse the query to find those records that did not match. Hope this makes sense.

SELECT GD_Dump.ID, GD_Dump.EMPLID, GD_Dump.LAST_NAME, GD_Dump.FIRST_NAME, GD_Dump.NAME, GD_Dump.LOCATION, GD_Dump.DESCR, GD_Dump.ADDRESS1, GD_Dump.ADDRESS2, GD_Dump.ADDRESS3, GD_Dump.CITY, GD_Dump.STATE, GD_Dump.POSTAL, GD_Dump.PHONE, GD_Dump.COUNTRY
FROM GD_Dump INNER JOIN HR_CTI ON (GD_Dump.FIRST_NAME = HR_CTI.Fname) AND (GD_Dump.LAST_NAME = HR_CTI.Lname);
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Question by:dgelinas
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Expert Comment

by:nico5038
ID: 10775310
In the query editor double click the join lines and make one table "leading"
Next make the unique ID of the "optional" table to be compared with "Is Null" (without quotes)

This will give the half of the outer join needed as all non-matching from the leading table will appear.

Next do the same "the other way around" to get the second half.

A UNION query can be used when you want the complete set.

Clear ?

Nic;o)
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by:dgelinas
ID: 10775323
I was hoping for an easier solution in SQL. I'll try what you suggest but it sounds a little hairy.
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nico5038 earned 1000 total points
ID: 10775444
It's all SQL, just gave the directions to use the graphical query editor as it'is easy to see the relation and to know what main key need to be tested for being Null.

Like
TableX -> TableY
test ID from TableY to be null to get the non-matching TableX rows
TableX <- TableY
test ID from TableX to be null to get the non-matching TableY rows

Nic;o)
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LVL 44

Expert Comment

by:Arthur_Wood
ID: 10775463
to find the records in GD_DUMP that ARE NOT in HR_CTI:

SELECT GD_Dump.ID, GD_Dump.EMPLID, GD_Dump.LAST_NAME, GD_Dump.FIRST_NAME, GD_Dump.NAME, GD_Dump.LOCATION, GD_Dump.DESCR, GD_Dump.ADDRESS1, GD_Dump.ADDRESS2, GD_Dump.ADDRESS3, GD_Dump.CITY, GD_Dump.STATE, GD_Dump.POSTAL, GD_Dump.PHONE, GD_Dump.COUNTRY
FROM GD_Dump LEFT JOIN HR_CTI ON (GD_Dump.FIRST_NAME = HR_CTI.Fname) AND (GD_Dump.LAST_NAME = HR_CTI.Lname) where HR_CTI.FNAme is Null;

you can also build this easily with the Access Query Builder, using the UnMatched Query Wizard (Query Builder/New/UnMatched Query Builder)

AW
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