--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...
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其他好文 时间:
2015-03-16 19:17:29
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150
Combination SumGiven a set of candidate numbers (C) and a target number (T), find all unique combinations inCwhere the candidate numbers sums toT.Thes...
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其他好文 时间:
2015-03-16 12:26:00
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124
SELECT setval('tablename_id_seq', (SELECT MAX(id) FROM tablename)+1)
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其他好文 时间:
2015-03-16 10:58:32
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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...
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其他好文 时间:
2015-03-15 23:45:04
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386
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...
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2015-03-15 23:43:50
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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 ...
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其他好文 时间:
2015-03-15 23:31:23
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Given a collection of candidate numbers (C) and a target number (T), find all unique combinations inCwhere the candidate numbers sums toT.Each number ...
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2015-03-15 22:36:24
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https://leetcode.com/problems/combination-sum/Given a set of candidate numbers (C) and a target number (T), find all unique combinations inCwhere the ...
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其他好文 时间:
2015-03-15 21:11:57
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122
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....
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2015-03-15 21:02:34
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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...
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其他好文 时间:
2015-03-15 16:38:17
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120