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搜索关键字:the unique mst    ( 5979个结果
1.索引、约束
--mysql中为一张表的两个字段添加唯一约束--[问题]约束和索引的区别是什么?唯一索引和唯一约束,联合约束的关系是什么?alter table 表名 add constraint 约束名 UNIQUE(字段一,字段二);--例如:ALTER TABLE questionitem ADD cons...
分类:其他好文   时间:2015-03-16 19:17:29    阅读次数:150
[leetcode] Combination Sum
Combination SumGiven a set of candidate numbers (C) and a target number (T), find all unique combinations inCwhere the candidate numbers sums toT.Thes...
分类:其他好文   时间:2015-03-16 12:26:00    阅读次数:124
IntegrityError duplicate key value violates unique constraint - django/postgres
SELECT setval('tablename_id_seq', (SELECT MAX(id) FROM tablename)+1)
分类:其他好文   时间:2015-03-16 10:58:32    阅读次数:155
LeetCode --- 62. Unique Paths
题目链接:Unique Paths A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any point in time. The robot is try...
分类:其他好文   时间:2015-03-15 23:45:04    阅读次数:386
LeetCode --- 63. Unique Paths II
题目链接: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 is marked as 1 and 0 resp...
分类:其他好文   时间:2015-03-15 23:43:50    阅读次数:310
[Leetcode]Unique Paths
A robot is located at the top-left corner of amxngrid (marked 'Start' in the diagram below).The robot can only move either down or right at any point ...
分类:其他好文   时间:2015-03-15 23:31:23    阅读次数:132
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:2015-03-15 22:36:24    阅读次数:144
Combination Sum
https://leetcode.com/problems/combination-sum/Given a set of candidate numbers (C) and a target number (T), find all unique combinations inCwhere the ...
分类:其他好文   时间:2015-03-15 21:11:57    阅读次数:122
Unique Binary Search Trees II
Unique Binary Search Trees II问题:Givenn, generate all structurally uniqueBST's(binary search trees) that store values 1...n.思路: dfs我的代码:public class S....
分类:其他好文   时间:2015-03-15 21:02:34    阅读次数:121
全局ID的重要性
全局ID的重要性体现在sharding的时候gtid MySQL:global transaction iduuid:universally unique identifierguid:global universally unique identifier自增idGUID(全局统一标识符) 分库分...
分类:其他好文   时间:2015-03-15 16:38:17    阅读次数:120
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