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Re: Question about pattern matching

From: Julius Tuskenis <julius(dot)tuskenis(at)gmail(dot)com>
To:
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Question about pattern matching
Date: 2008-12-23 17:37:02
Message-ID: 495121BE.2050107@gmail.com (view raw or flat)
Thread:
Lists: pgsql-general
Hi, Dimitris

I think simple
SELECT TABLENAME.id
FROM TABLENAME
WHERE  prm_patern ilike  TABLENAME.candidate_pattern||'%' 
ORDER BY |char_length(|TABLENAME.candidate_pattern) desc
LIMIT 1 
should do the trick. (Provided TABLENAME is not very large of course)

Julius Tuskenis



dimitris(dot)sakellarios(at)telesuite(dot)gr rašė:
> TABLENAME
>
> id    Candidate pattern
> -------------------------
> 1    0089258068520
> 2    008925806852
> 3    00892580685
> 4    0089258068
> 5    008925806
> 6    00892580
> 7    0089258
> 8    008925
> 9    00892
> 10    0089
> 11    008
> 12    00
> 13    0
>
>
> PATTERN
> -------
> 0089257000000
>
> QUESTION
> --------
> Pls let me know which is the best way to match the
> following pattern against this table and Receive id = 8
> that is the longest matching pattern from left to right.
>
> BR,
> Sakellarios Dimitris.
>
>

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