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SQL Server中建立外键的方法
在SQL中建立外键约束,可以级联查询表中的数据,在C#代码生成器中,也能根据外键关系生成相应的外键表数据模型。外键也可防止删除有外键关系的记录,一定程度上保护了数据的安全性。步骤:1、要建立外键关系,首先要保证用来建立外键关系的列具有唯一性,即具有 UNIQUE 约束通常是某表的主键作为另外一个表....
分类:数据库   时间:2014-06-27 21:47:54    阅读次数:284
Leetcode: Unique Binary Search Trees
Given n, how many structurally unique BST's (binary search trees) that store values 1...n?For example,Given n = 3, there are a total of 5 unique BST's...
分类:其他好文   时间:2014-06-27 18:22:07    阅读次数:191
[leetcode] Combination Sum II
Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.
分类:其他好文   时间:2014-06-27 12:52:03    阅读次数:213
[leetcode] Longest Palindromic Substring
Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longes...
分类:其他好文   时间:2014-06-27 12:46:45    阅读次数:238
[leetcode] 3Sum
Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of ...
分类:其他好文   时间:2014-06-27 12:27:28    阅读次数:169
[leetcode] 4Sum
Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array whic...
分类:其他好文   时间:2014-06-27 12:13:18    阅读次数:207
[leetcode] Combination Sum
Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.
分类:其他好文   时间:2014-06-27 12:11:50    阅读次数:337
Leetcode Combination Sum
Given a set of candidate numbers (C) and a target number (T), find all unique combinations inCwhere the candidate numbers sums toT.Thesamerepeated num...
分类:其他好文   时间:2014-06-26 15:50:35    阅读次数:176
Leetcode Combination Sum II
Given a collection of candidate numbers (C) and a target number (T), find all unique combinations inCwhere the candidate numbers sums toT.Each number ...
分类:其他好文   时间:2014-06-26 15:45:49    阅读次数:163
[]leetcode]Unique Paths II
Follow up for "Unique Paths":Now consider if some obstacles are added to the grids. How many unique paths would there be?An obstacle and empty space i...
分类:其他好文   时间:2014-06-25 09:17:03    阅读次数:159
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