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SQL Server编程必知必会 -- (37-50点总结)
----------------------------汇总数据-----------------------------聚集函数用来汇总数据。由多种方法来返回所需的结果,高效,快速获得结果;--37.返回products表中所有产品的平均价格SELECTAVG(prod_price)ASavg_priceFROMproducts--38.返回products表中供应商ID=1003所有..
分类:数据库   时间:2015-10-13 19:31:26    阅读次数:253
python 局部local和全局global变量
global和local变量虽然简单,但是还是记录一下,主要是转载转载自:http://blog.sina.com.cn/s/blog_436992740102ux8z.html先看一段代码:可见 old_price 是个全局变量, final_price 是局部变量运行结果是:局部变量拿到外面来如...
分类:编程语言   时间:2015-10-12 18:53:05    阅读次数:350
[LeetCode]: 121: Best Time to Buy and Sell Stock
题目:Say you have an array for which theithelement is the price of a given stock on dayi.If you were only permitted to complete at most one transaction ...
分类:其他好文   时间:2015-10-12 14:17:49    阅读次数:169
Leetcode--Best Time to Buy and Sell Stock III
Problem Description:Say you have an array for which theithelement is the price of a given stock on dayi.Design an algorithm to find the maximum profit...
分类:其他好文   时间:2015-10-11 12:46:28    阅读次数:158
SQL常见面试题(借书卡表_图书表_借书记录表)
问题描述:本题用到下面三个关系表:CARD 借书卡: CNO 卡号,NAME 姓名,CLASS 班级BOOKS 图书: BNO 书号,BNAME 书名,AUTHOR 作者,PRICE 单价,QUANTITY 库存册数BORROW 借书记录: CNO 借书卡号,BNO 书号,RDATE 还书日期备注:...
分类:数据库   时间:2015-10-10 17:11:36    阅读次数:1203
LeetCode——Best Time to Buy and Sell Stock IV
Description:Say you have an array for which theithelement is the price of a given stock on dayi.Design an algorithm to find the maximum profit. You ma...
分类:其他好文   时间:2015-10-08 19:53:47    阅读次数:130
echosp 销量排行 新增实际价格
找到lib_goods.php第147行,代码$sql = 'SELECT g.goods_id, g.goods_name, g.shop_price,g.goods_thumb, SUM(og.goods_number) as goods_number ' .1.替换一下代码$sql = 'SE...
分类:其他好文   时间:2015-10-08 18:06:46    阅读次数:141
oracle中nvarchar2字符集不匹配
oracle当多表union时遇到nvarchar2类型时报错 字符集不匹配对使用nvarchar的地方,加上 to_char( nvarchar 的变量或字段 )如:select to_char(name),price from aaunion allselect to_char(name),pr...
分类:数据库   时间:2015-10-08 16:33:17    阅读次数:155
LeetCode——Best Time to Buy and Sell Stock
Description:Say you have an array for which theithelement is the price of a given stock on dayi.If you were only permitted to complete at most one tra...
分类:其他好文   时间:2015-10-08 00:29:17    阅读次数:167
[CareerCup] 10.1 Client-facing Service 面向客户服务器
10.1 Imagine you are building some sort of service that will be called by up to 1000 client applications to get simple end-of-day stock price informat...
分类:其他好文   时间:2015-10-02 07:53:54    阅读次数:217
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