declare v_sal number(5) := 6000; begin --if you could not see the output in console, you should set output on first use the command in command line : set serveroutput on dbms_output.put_line(v_sal); end;
Oracle PLSQL Demo - 01.定义变量、打印信息
原文：http://www.cnblogs.com/nick-huang/p/4609048.html