Re: [SQL] customising serial type
Am Dienstag, 21. Juni 2005 12:01 schrieben Sie:
> hi,in a table with a serial datatype, how do i get the sequence to start at
> a specific number like 10?
Use START in the create sequence statement.
#
create sequence seq_xeingang increment 1 start 1000;
;
CREATE TABLE xeingang
(
idinteger default nextval('seq_xeingang'),
buchchar not null,
eingdt date not null,
jnr integer not null,
grp integer,
code integer not null
);
my best regards..
Stefan
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Re: [SQL] group by function, make SQL cleaner?
this should work,
#
SELECT date_trunc('day',endtime),count(*)
FROM eg_event where endtime >= '2006-02-01' and endtime < '2006-03-01'
GROUP BY 1
ORDER BY 1;
best regards,
Stefan
Am Donnerstag, 16. März 2006 06:18 schrieb Bryce Nesbitt:
> I've got a working query:
>
> stage=# SELECT date_trunc('day',endtime),count(*)
> FROM eg_event where endtime >= '2006-02-01' and endtime < '2006-03-01'
> GROUP BY date_trunc('day',endtime)
> ORDER BY date_trunc('day',endtime);
>
> date_trunc | count
> -+---
> 2006-02-01 00:00:00 | 253
> 2006-02-02 00:00:00 | 245
> 2006-02-03 00:00:00 | 231
> 2006-02-04 00:00:00 | 313
> 2006-02-05 00:00:00 | 285
> 2006-02-06 00:00:00 | 194
> 2006-02-07 00:00:00 | 229
> 2006-02-08 00:00:00 | 239
> 2006-02-09 00:00:00 | 250
> 2006-02-10 00:00:00 | 245
> 2006-02-11 00:00:00 | 275
>
> Is there a way to eliminate the ugly repeated use of
> date_trunc('day',endtime)?
>
>
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Re: [SQL] regarding join
given this.
create table AA (id serial,name varchar(15));
create table BB (id serial,name varchar(15));
insert into AA (name) values ('1243f');
insert into AA (name) values ('asdfef');
insert into AA (name) values ('fdbsfd');
insert into AA (name) values ('btgrt');
insert into AA (name) values ('crregsewf');
insert into AA (name) values ('xedrgeef');
insert into BB (name) values ('243f');
insert into BB (name) values ('sdfef');
insert into BB (name) values ('dbsfd');
insert into BB (name) values ('tgrt');
insert into BB (name) values ('rregsewf');
insert into BB (name) values ('edrgeef');
you could try: (if you just need the one column "name")
select name from AA union select name from BB order by name;
a real nice way to go about this is:
create table CC (id serial,name varchar(15));
create table AA() inherits(CC);
create table BB() inherits(CC);
insert into AA (name) values ('1243f');
insert into AA (name) values ('asdfef');
insert into AA (name) values ('fdbsfd');
insert into AA (name) values ('btgrt');
insert into AA (name) values ('crregsewf');
insert into AA (name) values ('xedrgeef');
insert into BB (name) values ('243f');
insert into BB (name) values ('sdfef');
insert into BB (name) values ('dbsfd');
insert into BB (name) values ('tgrt');
insert into BB (name) values ('rregsewf');
insert into BB (name) values ('edrgeef');
=> select * from AA;
id | name
+---
1 | 1243f
2 | asdfef
3 | fdbsfd
4 | btgrt
5 | crregsewf
6 | xedrgeef
(6 rows)
=> select * from BB;
id | name
+--
7 | 243f
8 | sdfef
9 | dbsfd
10 | tgrt
11 | rregsewf
12 | edrgeef
(6 rows)
=> select * from CC order by name;
id | name
+---
1 | 1243f
7 | 243f
2 | asdfef
4 | btgrt
5 | crregsewf
9 | dbsfd
12 | edrgeef
3 | fdbsfd
11 | rregsewf
8 | sdfef
10 | tgrt
6 | xedrgeef
(12 rows)
by best regards,
Stefan
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Am Samstag, 25. März 2006 07:36 schrieb AKHILESH GUPTA:
> hi all,
> below I have created two tables in pgsql with field name as 'name' and 'id'
> as their datatype 'varchar(15)' and 'integer'.
>
> One of the table is:->
> chemical=> select * from test1;
> name | id
> ---+
> akhil | 1
> b | 2
> c | 3
> d | 4
> e | 5
> f | 6
> (6 rows)
>
> Another table is:->
> chemical=> select * from test3;
> name | id
> --+
> ab | 1
> cd | 2
> ef | 3
> gh | 4
> (4 rows)
>
> i want the output as:->
> name | id
> ---+
> akhil | 1 -from test1 table
> ab | 1--from test2 table
> b | 2-from test1 table
> cd | 2--from test2 table
> c | 3-from test1 table
> ef | 3--from test2 table
> d | 4-from test1 table
> gh | 4--from test2 table
> e | 5-from test1 table
> f | 6-from test1 table
>
> i have tried all the joins but it makes different fields for different
> tables.
> is there any way out for this kind of output??
> (plz reply asap)urgent.
>
> THANKS IN ADVANCE
>
> --
> Thanks & Regards,
> Akhilesh
> S/W Trainee (EDP),
> NUCHEM Pvt. Ltd.,
> Faridabad(Haryana)
> GSM:-(+919891606064)
>
> "FAILURES CAN BE FORGIVEN BUT AIMING LOW IS A CRIME"
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[SQL] Is there a solution for "SELECT OR INSERT"
given a simply table table like this:
create table MyTabl
(id serial,
lname varchar,
primary key (id)
)
I am trying to return the Primary-Key for a given
row regardless of the wanted row already being
in the table.
using something like:
select coalesce
(
(select id from MyTabl where lname='wanted'),
(insert into MyTabl (lname) values ('wanted') returning id)
) as id;
the above doesn't allow the insert..returning even thow
a similar select statement would be okay.
Is there a way to get the ID row OR create a new one in
ONE single statement?
my best regards and thank-you
for your time
Stefan
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[SQL] how do I to generate a sequence Range or Set of integer constants
dear SQL friends, What I want to do might be done differantly. Right now I can't think of another solution other than a select statement I would like to create a sequence range of integer constants. Join this sequence against a ID Range in a database and look for missing Id's. Another application for this would be to simply populate a database with say 1000.. Records Now: Is there a syntax that allows for the following. create table XX (id int); insert into XX (select xx from "1 to 1000" of integers) or... select IntSeq.MissingValues, x.UniqIntId,x.A,x.B,x.C, from MyDataTable x left outer join ( select MissingValues from "1 to 1000" of integers ) IntSeq on MissingValues=x.UniqIntId I'm hoping that someone has done this and might be able to point to some function or methode to do this Thanks, Stefan Becker -- email: [EMAIL PROTECTED] tel : +49 (0)6232-497631 http://www.yukonho.de ---(end of broadcast)--- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
Re: [SQL] Selecting exactly one row for each column value
Am Dienstag, 6. März 2007 16:03 schrieb Florian Weimer: > a | b | c > ---+---+--- > 5 | 6 | 7 > 2 | 3 | 4 > 1 | 2 | 3 Hi, couldn't you accomplish this by: select distinct on (a) * from tablename order by a; here: create table tab (a int,b int,c int); insert into tab values (1,2,3); insert into tab values (5,6,7); insert into tab values (1,2,3); insert into tab values (2,3,4); insert into tab values (1,2,2); insert into tab values (2,3,4); select * from tab; a | b | c ---+---+--- 1 | 2 | 3 5 | 6 | 7 1 | 2 | 3 2 | 3 | 4 1 | 2 | 2 2 | 3 | 4 (6 rows) select distinct on (a) * from tab order by a; a | b | c ---+---+--- 1 | 2 | 3 2 | 3 | 4 5 | 6 | 7 (3 rows) my regards, Stefan -- email: [EMAIL PROTECTED] tel : +49 (0)6232-497631 http://www.yukonho.de ---(end of broadcast)--- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
Re: [SQL] ROW_NUMBER alias
I might be told off by some better SQL-User here on the list -
still here is my 2 Cents worth
> I needed ROW_NUMBER() in PostGresql and I did find the 'temporary sequence'
> method as a workaround and i think it at least gets the job done relatively
you use:
> CREATE TEMP SEQUENCE rownum;
> SELECT nextval('rownum') AS row_number , t.a, t.b, t.c
> FROM (
> SELECT a, b, c
> FROM table
> WHERE table_id = 973
> ORDER BY record_date
> ) t;
Doesn't this just return the 973th single record for the current
sequence order in your table?
I believe:
SELECT a, b, c FROM table
offset 973 limit 1
will accomplish the same result.
Stefan
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Re: [SQL] pg_clog (?) problem with VACUMM
Dear Gerardo and Pgsql-List, >When executing a VACUUM, i have this msg: >gse_new_version=# VACUUM ; >ERROR: could not access status of transaction 118 >DETAIL: could not open file "pg_clog/": No existe el fichero o el I had a similar problem. I decided one day to "clean" out The pg_clog/ directory of the database cluster. These files' "last modified time Stamps" on many files were quite old, so I deleted them. This didn't have any consequences for the data (dumps or indexes etc.) or the operation of the installation except, as I found out MUCH later found out - I could no longer vacuum the Database. I restored the missing files from a backup and everything was okay again, after a vacuum of the database the system cleaned out the older pg_log/ files on its own. I hope you get things fixed! My best regards, Stefan Becker Email: [EMAIL PROTECTED] ---(end of broadcast)--- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
