pl_sql_variables.sql

declare
  -- variable_name [CONSTANT] datatype [NOT NULL]
  x number:=1;
  emp_hiredate date;
  emp_deptno number(2) not null := 10;
  city varchar2(13) := 'Damascus';
  xyz constant number := 1400;
begin
  x:=x+1;
  emp_hiredate:='13-NOV-14';
  dbms_output.put_line(emp_hiredate);
  dbms_output.put_line(x);
end;