Oracle的PL/SQL Developer 中如何输出：

开始

在 sql worksheet 中，执行一个 block 之前，执行 set serveroutput on;

set serveroutput on;
declare g_salary number:=100;
begin
  select salary into g_salary from employees where employee_id=178;
  dbms_output.put_line('the salary is:'|| g_salary);
end;

script out 窗口中输出：

anonymous block completed
the salary is:7000

结束