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UVAlive 6763 Modified LCS
LCS stands for longest common subsequence, and it is a well known problem. A sequence in thisproblem means a list of integers, and a sequence X is con...
分类:其他好文   时间:2014-08-22 00:14:45    阅读次数:303
数据库语句学习
1、查询语句 (1)select 列名, 列名, ... from 表名 例:setect * from 表名 获取表格中所有内容 (2)select distinct 列名, 列名, ... from 表名 //获取某列唯一不同的值 (3)select 列名...
分类:数据库   时间:2014-08-21 22:35:54    阅读次数:320
Oracle 数据库(oracle Database)Select 多表关联查询方式
Oracle数据库中Select语句语法及介绍SELECT [ ALL | DISTINCT ] ,[,…][WHERE ][GROUP BY [HAVING]][ORDER BY [ASC | DESC]]语句说明:[]方括号为可选项[GROUP BY [HAVING]]指将结果按的值进行分组.....
分类:数据库   时间:2014-08-21 16:45:54    阅读次数:292
LeetCode "Distinct Subsequences" - TO BE REVISED
A classic and representative DP problem. To be revised later. Quite a few interesting details to think about.class Solution {public: int numDistinc...
分类:其他好文   时间:2014-08-21 13:03:34    阅读次数:180
projecteuler---->problem=29----Distinct powers
Problem 29 Consider all integer combinations of ab for 2 ≤ a ≤ 5 and 2 ≤ b ≤ 5: 22=4, 23=8, 24=16, 25=32 32=9, 33=27, 34=81, 35=243 42=16, 43=64, 44=256, 45=1024 52=25, 53=125, 54=625, 55=312...
分类:其他好文   时间:2014-08-21 08:26:53    阅读次数:177
Oracle rownum影响执行计划
今天调优一条SQL语句,由于SQL比较复杂,用autotrace很难一眼看出哪里出了问题,直接上10046。 SELECT AB.* FROM (SELECT A.*, rownum RN FROM (SELECT *         from (SELECT DISTINCT (D.DEVICE_ID), F.FUNCTION_LOCATION_ID                 f...
分类:数据库   时间:2014-08-20 21:14:23    阅读次数:447
ax没有distinct ,只能projId进行group by
Query query =new Query(); SysTableLookup lookup; QueryBuil dDataSource ds; TableId table=tableNum(InventTrans); FieldId field=f...
分类:其他好文   时间:2014-08-20 15:55:12    阅读次数:132
SQL语句知识点
1.SELECT选择 SELECT 列名称 FROM 表名称 SELECT * FROM 表名称(选择所有的列) SELECT SNO FROM SC SELECT * FROM SC2.DISTINCT列出不同的值,删除重复的 SELECT DISTINCT 列名称 FROM 表名称 ...
分类:数据库   时间:2014-08-20 08:09:56    阅读次数:179
poj之最长公共子序列
题目:poj 1458   Common Subsequence Description A subsequence of a given sequence is the given sequence with some elements (possible none) left out. Given a sequence X = another sequence Z = is a...
分类:其他好文   时间:2014-08-19 19:04:25    阅读次数:182
poj之最长递增子序列
题目:POJ 2533    Longest Ordered Subsequence Description A numeric sequence of ai is ordered if a1 a2 aN. Let the subsequence of the given numeric sequence (a1, a2, ..., aN) be any sequence (ai1...
分类:其他好文   时间:2014-08-19 16:37:44    阅读次数:218
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