Comments on: What are the different ways to generate rows?

By: Karl Reitschuster

Karl Reitschuster — Thu, 23 Feb 2006 21:37:01 +0000

Hi, The Date variant of igors model example :


SQL> 
SQL> SELECT add_months(trunc(sysdate), - (x-1)) AS date_gen from dual
  2  MODEL DIMENSION BY (1 AS z) MEASURES (1 x)
  3  RULES ITERATE (10) (x[ITERATION_NUMBER]=ITERATION_NUMBER+1);

DATE_GEN
-----------
23.01.2006
23.02.2006
23.12.2005
23.11.2005
23.10.2005
23.09.2005
23.08.2005
23.07.2005
23.06.2005
23.05.2005

10 rows selected

SQL>

Greetings Karl

By: Karl Reitschuster

Karl Reitschuster — Sat, 11 Feb 2006 19:00:18 +0000

Igor,
your example with model clause ist very impressing for me! Did not worke with 10G model clause yet
karl

By: gamyers

gamyers — Fri, 10 Feb 2006 04:41:23 +0000

10G, MODEL clause, just plug in the ITERATE :

SELECT x from dual
MODEL DIMENSION BY (1 AS z) MEASURES (1 x)
RULES ITERATE (7) (x[ITERATION_NUMBER]=ITERATION_NUMBER+1);

By: stbu

stbu — Wed, 08 Feb 2006 19:56:46 +0000

Seen on asktom website, you may use this:

create or replace type array
as table of number;

create or replace function
vtable( n in number default null )
return array
PIPELINED
as
begin
   for i in 1 .. nvl(n,999999999)
   loop
       pipe row(i);
   end loop;
   return;
end;
/

Sample usage:

select add_months ( to_date( '01.01.2006', 'DD.MM.YYYY' ), column_value-1) dt
  from table( vtable(12) );

DT
----------
01.01.2006
01.02.2006
01.03.2006
01.04.2006
01.05.2006
01.06.2006
01.07.2006
01.08.2006
01.09.2006
01.10.2006
01.11.2006
01.12.2006

By: Claudiu Ariton

Claudiu Ariton — Mon, 30 Jan 2006 16:00:02 +0000

Another way to generate rows is to use pipelined function

create or replace type t_number as table of number
/

create or replace function generate(v_inf number, v_sup number) return t_number
pipelined
as

begin

for i in v_inf..v_sup loop

pipe row (i);

end loop;

return;

end;
/

select * from table(cast(generate(1,11) as t_number))
/

Best regards,
Claudiu Ariton