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SQL优化--逻辑优化--视图重写与等价谓词重写
1)视图重写 视图的类型: a)用SPJ格式构造的视图,称为简单视图。 CREATE VIEW v1 AS SELECT x, y, z FROM t; b)用非SPJ格式构造的视图(带有GROUPBY等操作),称为复杂视图。 CREATE VIEW v2 AS SELECT x, y, z FROM t ORDER BY x; 视图重写:...
分类:数据库   时间:2015-02-07 17:30:27    阅读次数:226
数据库系列之查询(5)
内连接1 语法SELECT FROM 表1 INNER JOIN 表2 ON 表1.列名 条件运算符 表2.列名 [WHERE 条件] [ORDER BY 排序列] 其中“ON 表1.列名 条件运算符 表2.列名” 中,条件运算符常用的是:=、。 表1.列名和表2.列名,分...
分类:数据库   时间:2015-02-07 17:17:16    阅读次数:208
【leecode】 Spiral Matrix
Spiral MatrixGiven a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order. For example,Given the following ...
分类:其他好文   时间:2015-02-07 17:15:17    阅读次数:107
【leetcode】Spiral Matrix II
Spiral Matrix IIGiven an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. For example,Given n = 3,You should ret...
分类:其他好文   时间:2015-02-07 17:14:43    阅读次数:82
LeetCode 027 Remove Element
题目要求:Remove ElementGiven an array and a value, remove all instances of that value in place and return the new length.The order of elements can be chan...
分类:其他好文   时间:2015-02-07 17:11:25    阅读次数:146
Leetcode:Partition List
Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. You should preserve the original relative order of the nodes in each of...
分类:其他好文   时间:2015-02-07 16:02:00    阅读次数:141
数据库系列之查询(1)
基础查询 1 语法 SELECT FROM [WHERE ] [ORDER BY [ASC或DESC]] 2 示例 SELECT AuthorName, Email, Age FROM Authors WHERE City='北京' ORDER BY AuthorID...
分类:数据库   时间:2015-02-07 15:45:53    阅读次数:278
hdu4346 枚举思维
http://acm.hdu.edu.cn/showproblem.php?pid=4346 Problem Description There is a road from city A to city B.On the road,there are N positions(indexed from 0 to N-1).In order to celebrate the Mult...
分类:其他好文   时间:2015-02-07 13:14:04    阅读次数:114
delphi连接sql存储过程
针对返回结果为参数的一、 先建立自己的存储过程ALTER PROCEDURE [dbo].[REName] @Gender varchar(20)ASBEGIN select ROW_NUMBER() over(order by Name asc) as [序号], Name...
分类:数据库   时间:2015-02-07 13:03:17    阅读次数:133
Leetcode:Add Two Numbers
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a link...
分类:其他好文   时间:2015-02-07 09:08:17    阅读次数:165
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