Skip site navigation (1) Skip section navigation (2)

length limitation in '=' operator when comparing TEXT fields ?

From: "Michael Beckstette" <mbeckste(at)TechFak(dot)Uni-Bielefeld(dot)DE>
To: pgsql-bugs(at)postgresql(dot)org
Subject: length limitation in '=' operator when comparing TEXT fields ?
Date: 2002-05-23 19:23:55
Message-ID: 1020523212355.ZM10386@sirari.TechFak.Uni-Bielefeld.DE (view raw or flat)
Thread:
Lists: pgsql-bugs
Hi,

i have a little problem when selecting entries from a table, specified by a
 long match on a field of type TEXT. Is there a length limitation for the '='
operator when comparing a field of type TEXT to a given string ?

Example:

SELECT description FROM sequences_33 WHERE description LIKE 'gi 17559974%';

Result:

 gi 17559974 ref NP_506864.1  (NM_074463) acid phosphatase [Caenorhabditis
elega
ns] gi 7499536 pir  T21181 hypothetical protein F21A3.2 - Caenorhabditis
elegans
 gi 3876155 emb CAB04153.1  (Z81509) predicted using Genefinder Similarity to
As
pergillus acid phosphatase (TR:Q12546) cDNA EST yk3g4.5 comes from this gene
cDN
A EST yk69f10.5 comes from this gene cDNA EST yk231b3.5 comes from this gene
cDN
A EST yk285e4.5 comes from this gene cDN
(1 row)


Thats ok. And now:

SELECT description FROM sequences_33 WHERE description=' gi 17559974 ref
NP_506864.1  (NM_074463) acid phosphatase [Caenorhabditis elega
ns] gi 7499536 pir  T21181 hypothetical protein F21A3.2 - Caenorhabditis
elegans
 gi 3876155 emb CAB04153.1  (Z81509) predicted using Genefinder Similarity to
As
pergillus acid phosphatase (TR:Q12546) cDNA EST yk3g4.5 comes from this gene
cDN
A EST yk69f10.5 comes from this gene cDNA EST yk231b3.5 comes from this gene
cDN
A EST yk285e4.5 comes from this gene cDN'
(0 row)

The two strings are identical and there are no confusing characters in them.

Any idea ?

PS: The type of field description is TEXT

Thanx in advance

Michael

-------------------------------------------------------------------------------
Dipl.-Inform. Michael Beckstette        Office: M3-129
AG-PI / Technische Fakultaet            EMail:mbeckste(at)techfak(dot)uni-bielefeld(dot)de
Universitaet Bielefeld                  Fon: +49-521-106-2914
Postfach 100131                         Fax: +49-521-106-6411
D-33501 BIELEFELD
Germany

Responses

pgsql-bugs by date

Next:From: Tom LaneDate: 2002-05-23 20:15:23
Subject: Re: length limitation in '=' operator when comparing TEXT fields ?
Previous:From: Jean-Luc LachanceDate: 2002-05-23 16:34:50
Subject: Re: in(NULL)

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group