Обсуждение: Oracle decode Function in Postgres
Hi,
Like I see there is no equivalent to the Oracle decode Function
In Postgres.Is there maybe somebody who wrote decode as a
Function?
Schoeib
4Tek Gesellschaft für angewandte Informationstechnologien mbH
Schoeib Amin
Tel. +49 (0) 69 697688-132
Fax. +49 (0) 69 697688-111
http://www.4tek.de
Of course there is an equivalent: the case construct. There is some nice documentation about the available functions and operators at: http://www.postgresql.org/docs/view.php?version=7.3&idoc=0&file=functions.html and specifically for CASE: http://www.postgresql.org/docs/view.php?version=7.3&idoc=0&file=functions-conditional.html#AEN9698 You might also find useful to know that the NVL oracle function's parallel in postgres is COALESCE. HTH, Csaba. On Wed, 2003-09-03 at 11:00, Amin Schoeib wrote: > Hi, > Like I see there is no equivalent to the Oracle decode Function > In Postgres.Is there maybe somebody who wrote decode as a > Function? > > Schoeib > > 4Tek Gesellschaft für angewandte Informationstechnologien mbH > Schoeib Amin > Tel. +49 (0) 69 697688-132 > Fax. +49 (0) 69 697688-111 > http://www.4tek.de >
I read about that but, is there maybe somebody who wrote A decode function so that you can export Oracle code with decode Easily to Postgres. I ask for that cause I am a beginner in PGPLSQL. Thanxx Schoeib -----Ursprüngliche Nachricht----- Von: Csaba Nagy [mailto:nagy@ecircle-ag.com] Gesendet: Mittwoch, 3. September 2003 11:37 An: Amin Schoeib Cc: Postgres general mailing list Betreff: Re: [GENERAL] Oracle decode Function in Postgres Of course there is an equivalent: the case construct. There is some nice documentation about the available functions and operators at: http://www.postgresql.org/docs/view.php?version=7.3&idoc=0&file=functions.html and specifically for CASE: http://www.postgresql.org/docs/view.php?version=7.3&idoc=0&file=functions-conditional.html#AEN9698 You might also find useful to know that the NVL oracle function's parallel in postgres is COALESCE. HTH, Csaba. On Wed, 2003-09-03 at 11:00, Amin Schoeib wrote: > Hi, > Like I see there is no equivalent to the Oracle decode Function > In Postgres.Is there maybe somebody who wrote decode as a > Function? > > Schoeib > > 4Tek Gesellschaft für angewandte Informationstechnologien mbH Schoeib > Amin Tel. +49 (0) 69 697688-132 > Fax. +49 (0) 69 697688-111 > http://www.4tek.de >
Somebody asked recently on this list the exact same style of question about NVL, receiving the exact same style of answer, having the same objection :) Search in the archive (in the lat month or so) for "nvl" in the subject to see some answers. Cheers, Csaba. On Wed, 2003-09-03 at 12:25, Amin Schoeib wrote: > I read about that but, is there maybe somebody who wrote > A decode function so that you can export Oracle code with decode > Easily to Postgres. > I ask for that cause I am a beginner in PGPLSQL. > > Thanxx > > Schoeib > > -----Ursprüngliche Nachricht----- > Von: Csaba Nagy [mailto:nagy@ecircle-ag.com] > Gesendet: Mittwoch, 3. September 2003 11:37 > An: Amin Schoeib > Cc: Postgres general mailing list > Betreff: Re: [GENERAL] Oracle decode Function in Postgres > > > Of course there is an equivalent: the case construct. > There is some nice documentation about the available functions and operators at: http://www.postgresql.org/docs/view.php?version=7.3&idoc=0&file=functions.html > and specifically for CASE: http://www.postgresql.org/docs/view.php?version=7.3&idoc=0&file=functions-conditional.html#AEN9698 > You might also find useful to know that the NVL oracle function's parallel in postgres is COALESCE. > > HTH, > Csaba. > > On Wed, 2003-09-03 at 11:00, Amin Schoeib wrote: > > Hi, > > Like I see there is no equivalent to the Oracle decode Function > > In Postgres.Is there maybe somebody who wrote decode as a > > Function? > > > > Schoeib > > > > 4Tek Gesellschaft für angewandte Informationstechnologien mbH Schoeib > > Amin Tel. +49 (0) 69 697688-132 > > Fax. +49 (0) 69 697688-111 > > http://www.4tek.de > > > >
--- Amin Schoeib <aschoeib@4tek.de> wrote: > Hi, > Like I see there is no equivalent to the Oracle > decode Function > In Postgres.Is there maybe somebody who wrote decode > as a > Function? The problem for any such body is that there is no one function possible in PostgreSQL that will cover all of the possible use cases of "decode" in Oracle. As I understand things, "decode" takes a variable number of arguments, for a variety of datatypes. In PostgreSQL you would need to create a separate "decode" function for every distinct set of arguments (number and datatypes) that you are likely to encounter. That would be a lot of work for a generalized case. You may be best served by searching your code for usage of "decode", and writing only those versions that you need. The coding for each one would be trivial, using "case" constructions. > > Schoeib > > 4Tek Gesellschaft f�r angewandte > Informationstechnologien mbH > Schoeib Amin > Tel. +49 (0) 69 697688-132 > Fax. +49 (0) 69 697688-111 > http://www.4tek.de > > __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com
>I read about that but, is there maybe somebody who wrote >A decode function so that you can export Oracle code with decode >Easily to Postgres. >I ask for that cause I am a beginner in PGPLSQL. Perhaps you want to accommodate your Oracle code to the new Oracle 9i features. And that features supports CASE statement too: http://www.oracle-base.com/Articles/9i/Case9i.asp