在需要使用单引号的时候,'' 两个单引号代表一个单引号
dbms_output.put_line('--------------------------------------------');
dbms_output.put_line('Warning:There is no trigger need to disable.');
dbms_output.put_line('--------------------------------------------');
-----空行
--------------------------------------------
Warning:There is no trigger need to disable.
--------------------------------------------
PL/SQL procedure successfully completed.