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:...
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数据库 时间:
2015-02-07 17:30:27
阅读次数:
226
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...
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数据库 时间:
2015-02-07 17:17:16
阅读次数:
208
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 ...
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其他好文 时间:
2015-02-07 17:15:17
阅读次数:
107
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...
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其他好文 时间:
2015-02-07 17:14:43
阅读次数:
82
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...
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其他好文 时间:
2015-02-07 17:11:25
阅读次数:
146
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...
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其他好文 时间:
2015-02-07 16:02:00
阅读次数:
141
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...
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数据库 时间:
2015-02-07 15:45:53
阅读次数:
278
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...
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其他好文 时间:
2015-02-07 13:14:04
阅读次数:
114
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...
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数据库 时间:
2015-02-07 13:03:17
阅读次数:
133
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...
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其他好文 时间:
2015-02-07 09:08:17
阅读次数:
165