Re: Wildcard LIKE and Sub-select

Re: Wildcard LIKE and Sub-select

Travis Whitton wrote:
> Hi everybody,
> I have two tables of the following structure:
>
> Table "keywords"
>
> column   | type
> ---------------------
> id           | integer
> keyword | varchar(255)
>
> and
>
> Table "badwords"
>
> column   | type
> ----------------------
> badword  | varchar(255)
>
>
> I need to delete all the rows from the keywords table where badword 
> partially matches the keyword field. I know I can do an exact match 
> with a sub-select, but I'm not sure how to structure a wildcard match 
> / like clause with a sub-select. Also, is that the best way to do it, 
> or should I be looking into full-text? I have roughly 10 million 
> keywords and 1 million badwords.
>
> Thanks,
> Travis
>
Hmm...  Maybe (this is untested):

DELETE FROM keywords
USING badwords
WHERE keyword ILIKE ANY (SELECT '%' || badword || '%'                                                  FROM badwords)

-- 
erik jones 
software development
emma(r)

Wildcard LIKE and Sub-select

Hi everybody,
I have two tables of the following structure:

Table "keywords"

column   | type
---------------------
id           | integer
keyword | varchar(255)

and

Table "badwords" 

column   | type
----------------------
badword  | varchar(255)


I need to delete all the rows from the keywords table where badword partially matches the keyword field. I know I can do an exact match with a sub-select, but I'm not sure how to structure a wildcard match / like clause with a sub-select. Also, is that the best way to do it, or should I be looking into full-text? I have roughly 10 million keywords and 1 million badwords. 

Thanks,
Travis

Re: Wildcard LIKE and Sub-select