Search Postgresql Archives

Re: Converting row elements into a arrays?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 3/2/23 13:58, Ron wrote:
Postgresql 12.13

Given the sample below, I'm looking for how to generate this output.  It's like GROUP BY, but generating an array instead of an aggreate number.
 f1 | f2_array
----+---------
1 | {1,2,3}
  2 | {1,2,3,4}
  3 | {1,2}

The ultimate goal is to somehow use pg_index.indkey to get column names from pg_attribute.

create table foo (f1 int, f2 int);
insert into foo values (1, 1);
insert into foo values (1, 2);
insert into foo values (1, 3);
insert into foo values (2, 1);
insert into foo values (2, 2);
insert into foo values (2, 3);
insert into foo values (2, 4);
insert into foo values (3, 1);
insert into foo values (3, 2);

select * from foo order by f1, f2;
 f1 | f2
----+----
  1 |  1
  1 |  2
  1 |  3
  2 |  1
  2 |  2
  2 |  3
  2 |  4
  3 |  1
  3 |  2
(9 rows)


In which environment are you accessing that array?  psql only?









[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Postgresql Jobs]     [Postgresql Admin]     [Postgresql Performance]     [Linux Clusters]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Databases]     [Postgresql & PHP]     [Yosemite]

  Powered by Linux