Обсуждение: Selecting Current value from a sequence
Hi all,It is a very simple but I am not able to recall how to do it.... I just need to find out the current value of a seq. It is very simple select statement but I can't recall it... Help me please before I get myself get fired -:). Regards, Najm
Najm
CURRVAL('sequence_name')
For this and other sequence and serial functions, please see the online
version of Bruce's book.
BTW, O'Reilly's "SQL in at Nutshell" also catalogs all PGSQL functions
from ver. 6.5.
-Josh Berkus
--
______AGLIO DATABASE SOLUTIONS___________________________ Josh Berkus Complete
informationtechnology josh@agliodbs.com and data management solutions (415) 436-9166 for law firms, small
businesses fax 436-0137 and non-profit organizations. pager 338-4078 San
Francisco
Najm Hashmi wrote: > Hi all, > It is a very simple but I am not able to recall how to do it.... I > just need to find out the current value of a seq. It is very simple > select statement but I can't recall it... Help me please before I get > myself get fired -:). > Try: SELECT last_value FROM sequence_name; > Regards, Najm For me works (PostgreSQL 7.0.3, Mandrake Linux 7.2). George Moga, Data Systems Srl Slobozia, ROMANIA
> Najm
>
> CURRVAL('sequence_name')
>
> For this and other sequence and serial functions, please see the online
> version of Bruce's book.
>
> BTW, O'Reilly's "SQL in at Nutshell" also catalogs all PGSQL functions
> from ver. 6.5.
It does, or only the standard SQL functions? Do they have
PostgreSQL-specific stuff.
-- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610)
853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill,
Pennsylvania19026
Najm Hashmi wrote:
>
> Hi all,
> It is a very simple but I am not able to recall how to do it.... I
> just need to find out the current value of a seq. It is very simple
> select statement but I can't recall it... Help me please before I get
> myself get fired -:).
> Regards, Najm
select nextval('nameofseq');
See my book on sequences: http://www.postgresql.org/docs/awbook.html currval() is probably what you need. > Hi all, > It is a very simple but I am not able to recall how to do it.... I > just need to find out the current value of a seq. It is very simple > select statement but I can't recall it... Help me please before I get > myself get fired -:). > Regards, Najm > > -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania19026
Thank you all for your help. Najm
Clayton,
> > Hi all,
> > It is a very simple but I am not able to recall how to do it.... I
> > just need to find out the current value of a seq. It is very simple
> > select statement but I can't recall it... Help me please before I get
> > myself get fired -:).
> > Regards, Najm
>
> select nextval('nameofseq');
Sorry, no. You want SELECT CURRVAL('sequence_name'). NEXTVAL select
the NEXT value, and increments the sequence in the process.
-Josh Berkus
--
______AGLIO DATABASE SOLUTIONS___________________________ Josh Berkus Complete
informationtechnology josh@agliodbs.com and data management solutions (415) 436-9166 for law firms, small
businesses fax 436-0137 and non-profit organizations. pager 338-4078 San
Francisco
Bruce,
> > BTW, O'Reilly's "SQL in at Nutshell" also catalogs all PGSQL functions
> > from ver. 6.5.
>
> It does, or only the standard SQL functions? Do they have
> PostgreSQL-specific stuff.
Both. The book is set up to cover 1) the SQL99 standard, and 2)
Specific variants for SQL Server, MySQL, Oracle and PostgreSQL.
Unfortunately, the book was somewhat delayed in publication ( + 4 months
past list) so that it is a little out of date. Pgsql 6.5 is covered
without any notation on what will change/be added in 7.x. Still, since
I don't even *have* your book yet, it's better than nothing! :-)
-Josh Berkus
--
______AGLIO DATABASE SOLUTIONS___________________________ Josh Berkus Complete
informationtechnology josh@agliodbs.com and data management solutions (415) 436-9166 for law firms, small
businesses fax 436-0137 and non-profit organizations. pager 338-4078 San
Francisco