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(at)valigene(dot)com]
> > Sent: Monday, April 26, 1999 8:57 AM
> > To: pgsql-sql(at)hub(dot)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
> >