MySQL: Select pages that are not tagged?

Posted by lauthiamkok on Stack Overflow See other posts from Stack Overflow or by lauthiamkok
Published on 2011-02-09T23:15:56Z Indexed on 2011/02/09 23:26 UTC
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Hi,

I have a db with two tables like these below,

page table

pg_id    title
1        a
2        b
3        c
4        d

tagged table

tagged_id   pg_id
1           1
2           4

I want to select the pages which are tagged, I tried with this query below but doesn't work,

SELECT *
FROM root_pages
LEFT JOIN root_tagged ON ( root_tagged.pg_id =  root_pages.pg_id )
WHERE root_pages.pg_id !=  root_tagged.pg_id

It returns zero - Showing rows 0 - 1 (2 total, Query took 0.0021 sec)

But I want it to return

pg_id    title
    2        b
    3        c

My query must have been wrong?? How can I return the pages which are not tagged correctly?

Thanks.

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