Re: relevance - Mailing list pgsql-sql

From Terence Kearns
Subject Re: relevance
Date
Msg-id 3F160F2C.6050902@cts.canberra.edu.au
Whole thread Raw
In response to Re: relevance  (Oleg Bartunov <oleg@sai.msu.su>)
Responses Re: relevance  (Rajesh Kumar Mallah <mallah@trade-india.com>)
List pgsql-sql
>>select id from tablename where message like '%sql%';
>>
>>If there any way to determine exactly how many times 'sql' is matched in
>>that search in each particular row, and then sort by the most matches,
>>or am I going to have to write a script to do the sorting for me?
>>

You could probably write a function in postgres (say, "matchcount()") 
which returns the match count (possibly using perl and a regex).

SELECT matchcount(message,'sql') AS matchcount, id
FROM tablename
WHERE message LIKE '%sql%'
ORDER BY matchcount(message,'sql') DESC

The ORDER BY will probably fail, but you can try :)


-- 
Terence Kearns ~ ph: +61 2 6201 5516
IT Database/Applications Developer
Enterprise Information Systems
Client Services Division
University of Canberra
www.canberra.edu.au



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