New Feature for collections in Oracle 11

schulung — Sun, 08 Nov 2009 10:12:12 +0000

Starting with Oracle 11 it is now possible to use set operators on “some” collection types (ie varrays and nested tables, NOT index by Tables).

A simple example:
PROCEDURE COLL_SET_OP IS cursor c_emp(c_p_salary number) is select first_name, last_name, salary from employees where salary > c_p_salary;


  type t_emp is table of varchar2(50); 
   a1_emp t_emp := t_emp();

   a2_emp t_emp := t_emp();
   a_emp_op t_emp := t_emp();

   i number := 0;

BEGIN

   for r in c_emp(5000) loop

     i := i+1;

     a1_emp.extend;

     a1_emp(i) := r.last_name;

   end loop;
   i:=0;

   for r in c_emp(10000) loop

     i := i+1;

     a2_emp.extend;

     a2_emp(i) := r.last_name;

   end loop;
   dbms_output.put_line(cardinality(a1_emp));

   dbms_output.put_line(cardinality(a2_emp));
   a_emp_op := a1_emp multiset except a2_emp;

   i:=a_emp_op.first;

   while (i is not null) loop

   dbms_output.put_line(i ||' '||

                       a_emp_op(i));

i:=a_emp_op.next(i); end loop; END;

there are operators to mimic all SQL-set operators (union, minus, intersect). Its not exaclty a feature in PLSQL I’ve been anxiously waiting for, but there may be some uses for it. Please keep in mind that it won’t work for “index by varchar2″ tables which would make it a lot more usefull.

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New Feature for collections in Oracle 11