Howto check whether the input parameter of type table is NULL

Question

hi i have a procedure where the input parameters are of type collection (nested table ) the first line of my proc should check whether the input is null how to do that .
i have defined the collection this way.
CREATE OR REPLACE TYPE acct_tab as table of varchar2(40);
my procedure is as follows
create or replace procedure account_proc ( in_acct_array acct_tab) is
begin
----> I want to check whether the input is null how to do this?
end

Answer 1

Raj,
SQL> CREATE OR REPLACE TYPE acct_tab as table of varchar2(40);
  2  /
Type created.
SQL>
SQL> create or replace procedure account_proc ( in_acct_array acct_tab) is
  2  begin
  3  if in_acct_array IS EMPTY
  4  then
  5   dbms_output.put_line('empty') ;
  6  else
  7   dbms_output.put_line(' NOT empty') ;
  8  end if ;
  9  end;
10  /
Procedure created.
SQL>
SQL> declare
  2    v acct_tab:=acct_tab();
  3  begin
  4          account_proc( v ) ;
  5  end ;
  6  /
empty
PL/SQL procedure successfully completed.SS