SUM(A)+SUM(B) = SUM(A+B). • Define all NUMERIC columns as NOT NULL DEFAULT 0. • Use the ZEROIFNULL function nested within the aggregate function to convert any nulls to zeros for the computation, for example SUM(ZEROIFNULL(x) + ZEROIFNULL(y))
/*
*处理例外
*/
--例外简介
--处理例外-传递例外
declare
v_ename emp.ename%TYPE;
begin
SELECT ename INTO v_ename FROM emp
where empno=&no;
dbms_output.put_line('雇员名：'||v_ename);
exceptio
import java.util.ArrayList;
import java.util.List;
public class KickOutBadGuys {
/**
* 题目：13个坏人和13个好人站成一圈，数到7就从圈里面踢出一个来，要求把所有坏人都给踢出来，所有好人都留在圈里。请找出初始时坏人站的位置。
* Maybe you can find out
Redis.conf配置文件及相关项说明
# Redis configuration file example
# Note on units: when memory size is needed, it is possible to specifiy
# it in the usual form of 1k 5GB 4M and so forth:
#
public static String convertInputStreamToString(InputStream is) {
StringBuilder result = new StringBuilder();
if (is != null)
try {
InputStreamReader inputReader = new InputStreamRead
原文：
http://www.sitepoint.com/3-new-javascript-apis-may-want-follow/?utm_source=html5weekly&utm_medium=email
本文中，介绍3个仍然处于草稿阶段，但应该值得关注的Javascript API.
1) Web Alarm API
&
