Why can't I write DDL directly after a PLSQL anonymous block?

Question

I have the following simple script.

declare
begin
  null;
end;

create table &&DB_SCHEMA..test_table (
   test_column varchar(20)
);

Exec

Answer 1

You are simply missing a '/':

SQL> declare
  2  begin
  3    null;
  4  end;
  5  /

PL/SQL procedure successfully completed.

SQL> create table create_test_table (
  2     test_column varchar(20)
  3  );

Table created.

Here you find something more.