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MySQL.VIEWS
CREATE VIEW ProductCustomers AS -> SELECT cust_name, cust_contact, prod_id -> FROM Customers, Orders, OrderItems -> WHERE Customers.cust_id =...
分类:数据库   时间:2015-06-05 17:15:33    阅读次数:194
Rest Api how to retrieve list items from SharePoint Online
We will learn how to call Rest Api in SharePoint Online, here is the requirment: There is a customer list named "Customers", we will output the title of all items in the list. Introduce Rest Api: ...
分类:Windows程序   时间:2015-06-03 11:53:02    阅读次数:210
SQL Server临界点游戏——为什么非聚集索引被忽略!
当我们进行SQL Server问题处理的时候,有时候会发现一个很有意思的现象:SQL Server完全忽略现有定义好的非聚集索引,直接使用表扫描来获取数据。我们来看看下面的表和索引定义: 1 CREATE TABLE Customers 2 ( 3 CustomerID INT NOT NUL...
分类:数据库   时间:2015-06-02 19:34:20    阅读次数:230
entityFramework使用 codefirst
新建项目用nuget安装entityFramework,Install-Package Entityframework建一个model和context //[Table("Customers")] public class Customer { //[Key] ...
分类:其他好文   时间:2015-05-31 22:58:02    阅读次数:208
1016. Phone Bills (25) -vector排序(sort函数)
题目如下: A long-distance telephone company charges its customers by the following rules: Making a long-distance call costs a certain amount per minute, depending on the time of day when the call is...
分类:编程语言   时间:2015-05-26 21:35:30    阅读次数:1019
oracle pl/sql 实战学习 -避免误用
这几天看了下 oracle pl/sql 实战 这本书,出于对sql语句性能的研究,先研究下游标对代码的影响。 1.逐行处理 程序声明了一个游标c1,然后用游标for循环隐式地打开了这个游标,对从游标c1取出的每一行,程序查询customers表,并把first_name和last_name的值填充到变量,随后插入一行数据到top_sales_customers表。 问题...
分类:数据库   时间:2015-05-25 11:34:57    阅读次数:166
题目8:MySQL----------Duplicate Emails
Suppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all customers who never order anything. Table: Customers. +----+-------+ | Id | Na...
分类:数据库   时间:2015-05-24 08:53:15    阅读次数:164
LINQ to SQL 运行时动态构建查询条件
在进行数据查询时,经常碰到需要动态构建查询条件。使用LINQ实现这个需求可能会比以前拼接SQL语句更麻烦一些。本文介绍了3种运行时动态构建查询条件的方法。本文中的例子最终实现的都是同一个功能,从Northwind数据库Customers表中搜索出CompanyName列带有keywords中任意元素...
分类:数据库   时间:2015-05-22 00:24:54    阅读次数:189
[LeetCode][SQL]Customers Who Never Order
https://leetcode.com/problems/customers-who-never-order/Customers Who Never OrderSuppose that a website contains two tables, theCustomerstable and the...
分类:数据库   时间:2015-05-16 18:09:13    阅读次数:122
Customers Who Never Order
Suppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all customers who never order anything. Table: Customers....
分类:其他好文   时间:2015-05-01 18:48:26    阅读次数:124
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