Re: [SQL] substring

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
> >