Re: Convert Arbitrary Table to Array?

the array needs to be named to a different name than the original table e.g.
CREATE OR REPLACE TYPE DOUBLE_NUMBER AS OBJECT (num1 NUMBER,num2 NUMBER);

--Create an Array which will use 2 of the double_numbers we just created
CREATE OR REPLACE TYPE TABLE_ARRAY AS VARRAY(2) OF DOUBLE_NUMBER;

--Create a Table which will use the t_array
CREATE TABLE mytable (
 id INTEGER NOT NULL,
 t_array TABLE_ARRAY NOT NULL,
 PRIMARY KEY (id)
);

--A Table is now created which contains the 2 element ARRAY type structure as a column
INSERT INTO mytable VALUES(
1, TABLE_ARRAY(DOUBLE_NUMBER(1, 10),DOUBLE_NUMBER(1,15)));

SET DESCRIBE DEPTH ALL
SELECT id,m.t_array FROM mytable m;

SQL> SET DESCRIBE DEPTH ALL
SQL> SELECT id,m.t_array FROM mytable m;

        ID
----------
T_ARRAY(NUM1, NUM2)
--------------------------------------------------------------------------------

         1
TABLE_ARRAY(DOUBLE_NUMBER(1, 10), DOUBLE_NUMBER(1, 15))

HTH
Martin

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> Date: Tue, 10 Feb 2009 09:23:55 -0500
> Subject: Re: [GENERAL] Convert Arbitrary Table to Array?
> From: mmoncure@gmail.com
> To: hari.fuchs@gmail.com
> CC: pgsql-general@postgresql.org
>
> On Mon, Feb 9, 2009 at 4:14 PM, Harald Fuchs <hari.fuchs@gmail.com> wrote:
> > In article <17050.1234200030@sss.pgh.pa.us>,
> > Tom Lane <tgl@sss.pgh.pa.us> writes:
> >
> >> Lee Hughes <lee@hughesys.com> writes:
> >>> Hi, I need a function that accepts a table name and returns a 2-dimensional
> >>> array of the table data.
> >
> >> Well, in 8.3 and up there are arrays of composite types, so you can
> >> do something like
> >
> >> select array(select mytable from mytable);
> >
> > Interesting. On 8.3.5 I tried
> >
> > CREATE TABLE mytable (
> > id serial NOT NULL,
> > mytable int NOT NULL,
> > PRIMARY KEY (id)
> > );
> >
> > INSERT INTO mytable VALUES
> > (1, 10),
> > (2, 20),
> > (3, 30),
> > (4, 40),
> > (5, 50),
> > (6, 60);
> >
> > SELECT array(SELECT mytable FROM mytable);
> >
> > and it returned
> >
> > {10,20,30,40,50,60}
> >
> > Only when I renamed the second column from "mytable" to "mytablex" I got
> >
> > {"(1,10)","(2,20)","(3,30)","(4,40)","(5,50)","(6,60)"}
> >
> > as you promised. Is there any syntax for treating the first "mytable"
> > as a composite type name instead of a column name?
> >
>
> SELECT array(SELECT m FROM mytable m);
>
> There was a thread about this recently about how this my apply in
> insert/update situation.
>
> merlin
>
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