From: José Soares <jose@sferacarta.com>
To: Nuchanard Chiannilkulchai <nuch@valigene.com>
Cc: pgsql-sql@hub.org
Subject: Re: [SQL] substring
Date: Tue, 27 Apr 1999 15:01:32 +0200
Message-ID: <3725B52C.6012C851@sferacarta.com> (raw)
References: <93C04F1F5173D211A27900105AA8FCFC14541D@lambic.prevuenet.com>
<37257226.17A344FA@valigene.com>
Nuchanard Chiannilkulchai ha scritto:
> The problem is : select position ('_' in a ) from table_a does not
> work.
> ERROR: No such function 'strpos' with the specified attributes
>
> while select position('_' in '98-004_c136') ; give the right answer.
>
> I wonder how to introduce the attribute , and not the constant value.
>
> Michael J Davis wrote:
>
> > try:
> >
> > select a, substring(a, 1, position('_' in a) -1) from table_a;
> >
> > I have not tested this. Not sure if the parameters to substring are
> > correct. Also not sure if the -1 is needed.
> >
> > > -----Original Message-----
> > > From: Nuchanard Chiannilkulchai [SMTP:nuch@valigene.com]
> > > Sent: Monday, April 26, 1999 8:57 AM
> > > To: pgsql-sql@hub.org
> > > Subject: [SQL] substring
> > >
> > > Hello,
> > >
> > > How should I do my query to put a substring value in a field, in
> > > postgres ( I have 6.4) ?
> > > [snips]
>
> > > in sybase, this should be
> > > select a, substring(a,1,charindex('_',a)-1) from table_a
> > > a
> > > ---------------- ----------------
> > > 98-004_c136 98-004
> > > 98-005_c171 98-005
> > > P124_154 P124
> > >
charindex() is not SQL standard, with PostgreSQL you can
use this portable SQL standard query:
select a, substring(a from 1 for position('_' in a) - 1) as part from test;
a |part
-----------+------
98-004_c136|98-004
98-005_c171|98-005
P124_154 |P124
(3 rows)
José
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To: pgsql-sql@postgresql.org
Cc: jose@sferacarta.com, nuch@valigene.com, pgsql-sql@hub.org
Subject: Re: [SQL] substring
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