Problem in table(cast(

Question

i have two collection variables v1_coll and v2_coll(both are of same table type 'tt_coll' and 'rt_coll' is a record type)
tt_coll  is table of  rt_coll;
v1_coll    tt_coll := tt_coll();
v2_coll    tt_coll := tt_coll();
now i am populating the v1_coll through a select clause..
select ......... from table1, table2, table3 into v_coll1 where <lots of joins>;
now i want to populate the second collection v_coll2 from the first collection.
i dont want to make a for loop assigning each and every row of the first collection into the second..
so i table cast the first collection and do a select on that into the second...
select ......... into v2_coll from table(cast(v_coll1 as tt_coll));
but it is failing......please help me...

Answer 1

Note that you can use bulk collect to select into a local collection type, and to assign each and every row of the first collection to the second you can just use v2_coll := v1_coll
declare
type tt_coll is table of emp%rowtype;
v1_coll tt_coll := tt_coll();
v2_coll tt_coll := tt_coll();
begin
  select * bulk collect into v1_coll from emp where ename like 'S%';
  dbms_output.put_line('rows returned = '||to_char(SQL%ROWCOUNT));
  v2_coll := v1_coll;
  dbms_output.put_line('v2_col1(1).ename = '||v2_coll(1).ename);
  v2_coll(1).ename := 'JONES';
  dbms_output.put_line('v2_col1(1).ename = '||v2_coll(1).ename);
  dbms_output.put_line('v1_col1(1).ename = '||v1_coll(1).ename);
end;
rows returned = 2
v2_col1(1).ename = SMITH
v2_col1(1).ename = JONES
v1_col1(1).ename = SMITHRegards,
Bob