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access query design not in join

Posted on 2014-11-05
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Last Modified: 2014-11-05
Can anyone provide a basic syntax, whereby you want to list all rows of data in one table that dont exist in another table. The tables are joined on a specific field. The query wizad has a few options but non that meet "not in" type queries. Any pointers?
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Question by:pma111
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Vitor Montalvão earned 500 total points
ID: 40423573
For those kind of queries I like to use the NOT EXIST clause:
SELECT *
FROM Table1
WHERE NOT EXISTS (SELECT 1 
              FROM Table2
              WHERE Table2.ID = Table1.ID)

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by:pma111
ID: 40423590
What does the "SELECT 1" do in this context?
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Expert Comment

by:Vitor Montalvão
ID: 40423597
Since you don't want to return nothing you can use any constant value (1, 2,..., 'a', 'T', ...) or even NULL if you want. Doesn't matter what you put there will work. It's only because the SELECT needs to have a least a column name or a value.
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Author Comment

by:pma111
ID: 40423603
getting a syntax error for some reason in the

WHERE NOT EXISTS (SELECT 1
              FROM Table2
              WHERE Table2.ID = Table1.ID)

section. This is access 2010.
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Author Comment

by:pma111
ID: 40423661
it was because the field had a - in it so required the [ ] 's
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Expert Comment

by:ReneD100
ID: 40423681
Problem with the 'where not in' and 'where not exists' is that Access handles those very slowly I've noticed. What I normally do is link the tables through the key (in this case the 'ID') and then right click on the join in the designder, select 'show all records from table1', and put a 'IS NULL' on the ID from the 2nd table.
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by:Vitor Montalvão
ID: 40423689
Shouldn't be slow if the ID has index on it.
What you did in the designer is something like this with SQL syntax:
SELECT Table1.*
FROM Table1
LEFT OUTER JOIN Table2 ON Table2.ID = Table1.ID
WHERE Table2.ID IS NULL

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Expert Comment

by:ReneD100
ID: 40423700
I know what I did ;) But since the question was about 'the query wizard' I am sure it's easier to explain how to use it in the designer rather than the SQL editor.
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Expert Comment

by:Rey Obrero (Capricorn1)
ID: 40423810
using the Query wizard, select Find Unmatched Query wizard
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