码迷,mamicode.com
首页 >  
搜索关键字:unique constraint    ( 5568个结果
E - Puzzle( UVA-227)
PuzzleA children's puzzle that was popular 30 years ago consisted of a 5x5 frame which contained 24 small squares of equal size. A unique letter of th...
分类:其他好文   时间:2014-12-19 01:49:46    阅读次数:283
【LeetCode】Combination Sum
题目 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. The same repeated number may be chosen from C unlimi...
分类:其他好文   时间:2014-12-17 16:26:21    阅读次数:170
Longest Palindromic Substring(最长回文子串)
题目描述: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 l...
分类:其他好文   时间:2014-12-17 16:10:40    阅读次数:167
Primary Key and Unique Key difference in SQL Server
posted from http://www.sqlservergeeks.com/primary-key-and-unique-key-difference-in-sql-server/Primary and Unique Key both enforce uniqueness of column...
分类:数据库   时间:2014-12-17 16:03:52    阅读次数:181
【LeetCode】Permutations II 解题报告
【题目】 Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example, [1,1,2] have the following unique permutations: [1,1,2], [1,2,1], an...
分类:其他好文   时间:2014-12-17 12:49:36    阅读次数:140
Unique Binary Search Trees II
这道题承接Unique Binary Search Trees,只需要返回搜索二叉树的个数,用DP求解。但是这道题需要得到所有树的集合,可以用DFS求解。 原题是这个样子的: Given n, generate all structurally unique BST's (binary search trees) that store values 1...n. For example, Given n = 3, your program should return all 5 unique BST's...
分类:其他好文   时间:2014-12-17 00:23:26    阅读次数:191
【LeetCode】Combination Sum II (2 solutions)
Combination Sum IIGiven a collection of candidate numbers (C) and a target number (T), find all unique combinations inCwhere the candidate numbers sum...
分类:其他好文   时间:2014-12-16 16:39:06    阅读次数:264
【LeetCode】Combination Sum I & II 解题报告
【Combination Sum I】 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. The same repeated number may be cho...
分类:其他好文   时间:2014-12-16 11:45:46    阅读次数:186
排序,分组和集合操作
排序操作排序是计算机承担的最基本操作之一,尤其是在数据库处理领域,oracle也不例外。可能需要oracle排序数据的操作包括以下几种;(1)创建一个索引(2)通过groupby,unique或distinct关键字对数据进行分组或聚合(3)因为使用orderby子句使得数据按照排好的顺序返回(4)..
分类:编程语言   时间:2014-12-15 22:00:31    阅读次数:387
删除mysql数据库某一张主键表的所有外键关系
SELECT CONCAT('alter table ', TABLE_NAME , ' drop foreign key ', constraint_name, ';')FROM information_schema.KEY_COLUMN_USAGE a WHERE a.TABLE_SCHEMA=...
分类:数据库   时间:2014-12-15 15:15:29    阅读次数:271
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!