I wonder if position is a 6.5 feature? I am using 6.5.
-----Original Message-----From: José Soares [SMTP:jose@sferacarta.com]Sent: Tuesday, April 27, 1999 7:02 AMTo:
NuchanardChiannilkulchaiCc: pgsql-sql@hub.orgSubject: Re: [SQL] substring
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:
NuchanardChiannilkulchai [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
