Using the collection as a Table

Question

Hi,
I want to use a collection as a Table.Can anyone give me any code sample for that.
I am getting a collection through in parameter and want to join that rows with another table to out another collection.I want that because if I will do the operation in loop by taking the element one by one and comparing with the DB table record,the performance will be degraded.
Please give the solution for using a collection as a table to join it with another table.
Thanks in advance
Guljeet

Answer 1

Something like this probably will do for you.
SQL> create table t1 as
  2  select 1 col1 from dual union all
  3  select 2 from dual union all
  4  select 3 from dual;
Table created
SQL> create or replace type typ_row as object (col1 number, col2 varchar2(10));
  2  /
Type created
SQL> create or replace type typ_table as table of typ_row
  2  /
Type created
SQL> set serveroutput on
SQL>
SQL> declare
  2    tab_test typ_table := typ_table(typ_row(1, 'A'), typ_row(3, 'C'));
  3    cursor cur1 is
  4      select t1.col1, t2.col2
  5        from t1
  6        join table(tab_test) t2 on t1.col1 = t2.col1; --use table() and put your collection in it then join
  7  begin
  8    for rec in cur1 -- sample execution just for displaying the join performed
  9    loop
10      dbms_output.put_line(rec.col1 || ' ' || rec.col2);
11    end loop;
12  end;
13  /
1 A
3 C
PL/SQL procedure successfully completed
SQL> or, after creating the structures, simply run something like:
SQL> select t1.col1, t2.col2
  2        from t1
  3        join table(typ_table(typ_row(1, 'A'), typ_row(3, 'C'))) t2 on t1.col1 = t2.col1;
      COL1 COL2
         1 A
         3 C
SQL>