You were using the wrong join.
Your snippet is moving computation from a database
server to a client application, and it's doing that
whitout any particular need.
The canonical way of transforming your query should
go through a table JOIN. However, since you are subquerying
the same table, your nested query is nothing more
select object_id from mw_export_record
where table_object != 'advertisers'; -- <-- operator change
The inner part of your query is selecting all the IDs
containing 'advertisers', while the outer part is saying
"don't take any record from this list."
Not only you are computing in the client what should
be done in the server, but you are also telling the
server to do something unnecessarily complex and heavy
that it should not have been doing in the first place.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||