[PL/SQL] 如何规避异常ORA-01403

如果mytable表中不存在 ID = 123 的数据，那么

 SELECT Flag INTO flag FROM mytable WHERE ID = 123 将抛出异常ORA-01403

 SELECT nvl(max(Flag),'') INTO flag FROM mytable WHERE ID = 123 则不会有异常

具体参考：

http://www.itpub.net/thread-859456-1-1.html