[SQL] join with an array
Hi, I'm trying the following query: select array_agg(t1.id) from table1 t1 join table2 t2 on (t2.id = any(array_agg)) group by t1.col1; but I get this error: ERROR: column "array_agg" does not exist I tried aliasing array_agg(t1.id) without success. Thanks for any suggestions, -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
Re: [SQL] join with an array
In response to Louis-David Mitterrand :
> Hi,
>
> I'm trying the following query:
>
> select array_agg(t1.id) from table1 t1 join table2 t2 on (t2.id =
> any(array_agg)) group by t1.col1;
>
> but I get this error: ERROR: column "array_agg" does not exist
>
> I tried aliasing array_agg(t1.id) without success.
>
> Thanks for any suggestions,
I can't really understand what you want to achieve, but maybe this is
what you are looking for:
test=*# select * from a;
id | v
+---
1 | 1
2 | 1
3 | 1
4 | 1
5 | 2
6 | 2
(6 rows)
test=*# select * from b;
id
1
3
(2 rows)
test=*# select array_agg(a.id), v from a join b on (b.id in (select a.id from
a)) group by a.v;
array_agg | v
---+---
{1,2,3,4,1,2,3,4} | 1
{6,5,5,6} | 2
(2 rows)
Question: you are 'pif' in the irc-channel?
Regards, Andreas
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Re: [SQL] join with an array
On Wed, Feb 24, 2010 at 02:09:09PM +0100, A. Kretschmer wrote:
> In response to Louis-David Mitterrand :
> > Hi,
> >
> > I'm trying the following query:
> >
> > select array_agg(t1.id) from table1 t1 join table2 t2 on (t2.id =
> > any(array_agg)) group by t1.col1;
> >
> > but I get this error: ERROR: column "array_agg" does not exist
> >
> > I tried aliasing array_agg(t1.id) without success.
> >
> > Thanks for any suggestions,
> I can't really understand what you want to achieve, but maybe this is
> what you are looking for:
Here is a test case I built. I want to list all cruises by cruise_type
but after merging cruise_type that have the same cruise_type_name:
drop table cruise;
drop table cruise_type;
create table cruise_type (
id_cruise_type serial primary key,
cruise_type_name text
);
create table cruise (
id_cruise serial,
id_cruise_type integer references cruise_type,
cruise_date timestamp default now()
);
insert into cruise_type (cruise_type_name) values
('5 day eastern carribean cruise'),
('5 day western carribean cruise'),
('5 day eastern carribean cruise'),
('5 day western carribean cruise')
;
insert into cruise (id_cruise_type) values
(1),
(2),
(3),
(4),
(1),
(2),
(3),
(4)
;
select array_agg(ct.id_cruise_type),ct.cruise_type_name from cruise_type ct
join cruise c on (c.id_cruise = any(array_agg)) group by cruise_type_name;
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[SQL] Microsoft Sync Framework
Hi everyone, Has anybody tried to use microsoft sync framework with postgresql databases, whice requires a ton of sql convertion from sql server? If anybody is also trying that, please let me know and let's help each other out. Thanks, -- Ricardo S. Carvalho 4th year, Computer Engineering Aeronautics Institute of Technology, SP, Brazil
Re: [SQL] join with an array
Στις Wednesday 24 February 2010 15:34:48 ο/η Louis-David Mitterrand έγραψε:
> Here is a test case I built. I want to list all cruises by cruise_type
> but after merging cruise_type that have the same cruise_type_name:
>
> drop table cruise;
> drop table cruise_type;
>
> create table cruise_type (
> id_cruise_type serial primary key,
> cruise_type_name text
> );
>
> create table cruise (
> id_cruise serial,
> id_cruise_type integer references cruise_type,
> cruise_date timestamp default now()
> );
>
> insert into cruise_type (cruise_type_name) values
> ('5 day eastern carribean cruise'),
> ('5 day western carribean cruise'),
> ('5 day eastern carribean cruise'),
> ('5 day western carribean cruise')
> ;
>
> insert into cruise (id_cruise_type) values
> (1),
> (2),
> (3),
> (4),
> (1),
> (2),
> (3),
> (4)
> ;
>
> select array_agg(ct.id_cruise_type),ct.cruise_type_name from cruise_type ct
> join cruise c on (c.id_cruise = any(array_agg)) group by cruise_type_name;
>
You dont specify (in english) what you exactly want to achive, but here is my
shot:
1st, get the cruises by cruise type:
select ct.id_cruise_type,array_agg(c.id_cruise) as "List of Cruises" from
cruise_type ct, cruise c WHERE c.id_cruise_type=ct.id_cruise_type GROUP BY
ct.id_cruise_type ORDER BY ct.id_cruise_type;
id_cruise_type | List of Cruises
+-
1 | {1,5}
2 | {2,6}
3 | {3,7}
4 | {4,8}
(4 rows)
test=#
Then you may pretify this to include the name of each cruise type as well:
select ct.id_cruise_type,ct.cruise_type_name,array_agg(c.id_cruise) as "List of
Cruises" from cruise_type ct, cruise c WHERE c.id_cruise_type=ct.id_cruise_type
GROUP BY ct.id_cruise_type,ct.cruise_type_name ORDER BY ct.id_cruise_type;
id_cruise_type |cruise_type_name| List of Cruises
++-
1 | 5 day eastern carribean cruise | {1,5}
2 | 5 day western carribean cruise | {2,6}
3 | 5 day eastern carribean cruise | {3,7}
4 | 5 day western carribean cruise | {4,8}
(4 rows)
EXERCISE:
Why cant we exclude ct.id_cruise_type from the select clause and group by of
the above query?
--
Achilleas Mantzios
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