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Select Items Not Joined

Author

Topic

srolfe
Starting Member

1 Post

Posted - 2009-08-20 : 10:52:49

Assume I have two tables:

COUNTRY CONTINENT_ASSOC
---------------- -------------------------------
USA 1 CANADA
MEXICO 1 USA

Now, I want to write a query to identify that mexico is not in the continent_assoc table, but ignore the USA which is accociated (so the query would return only mexico). How would one do that?

vijayisonly
Master Smack Fu Yak Hacker

1836 Posts

Posted - 2009-08-20 : 10:56:48

Maybe this?

Sample Data

declare @country table (country varchar(20))
insert @country
select 'USA' union all
select 'Mexico'

declare @continent_assoc table(continent_assoc varchar(20))
insert @continent_assoc
select 'CANADA' union all
select 'USA'

Query
-----

select * from @country a where not exists (select * from @continent_assoc b where b.continent_assoc = a.country)

bklr
Master Smack Fu Yak Hacker

1693 Posts

Posted - 2009-08-21 : 00:11:43

do u want like this
SELECT a.* FROM @country a LEFT JOIN @continent_assoc b ON b.continent_assoc = a.country
WHERE b.continent_assoc IS NULL

SELECT * FROM @country a WHERE country NOT IN (SELECT continent_assoc FROM @continent_assoc)

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