As we all known,程序的错误一般分为两类:编译错误和运行时错误.其中运行时错误被称为异常.PL/SQL语句块中处理异常的部分即为异常处理部分.在异常处理部分,可以指定当特定异常发生时所采取的动作. PL/SQL有两种类型的异常:内置异常和用户自定义异常. 其中,内置异常又分为预定义异常和非预定义异常. 一.内置异常 首先试举一例来抛砖引玉. DECLARE v_ename ); v_empno ) := &v_empno; BEGIN SELECT ename INTO v_ena…
Given a complete binary tree, count the number of nodes. Definition of a complete binary tree from Wikipedia: In a complete binary tree every level, except possibly the last, is completely filled, and all nodes in the last level are as far left as po…