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mysql基本优化
MYSQL处理百万级以上的数据提高查询速度的方法,其它数据库应用也有一定的参考价值:1.应尽量避免在 where 子句中使用!=或操作符,否则将引擎放弃使用索引而进行全表扫描。2.对查询进行优化,应尽量避免全表扫描,首先应考虑在 where 及 order by 涉及的列上建立索引。3.应尽量避免在...
分类:数据库   时间:2014-07-16 23:25:20    阅读次数:272
poj 3264 Balanced Lineup
DescriptionFor the daily milking, Farmer John'sNcows (1 ≤N≤ 50,000) always line up in the same order. One day Farmer John decides to organize a game o...
分类:其他好文   时间:2014-06-28 09:32:17    阅读次数:200
ProjectRuler 算法练习之 位数组成字符串相同的整数
Problem :It can be seen that the number, 125874, and its double, 251748, contain exactly the same digits, but in a different order.Find the smallest positive integer, x, such that 2x, 3x, 4x, 5x, and ...
分类:其他好文   时间:2014-06-28 08:13:17    阅读次数:249
ORA-02287: 此处不允许序号
ORA-02287: 此处不允许序号 insert into gls_vchitem (viid, yr, km) select gls_vchitem_seq.nextval as viid, yr, km from gls_vchitem_tmp order by km; 不能有order by 或group by...
分类:其他好文   时间:2014-06-28 08:12:41    阅读次数:257
[LeetCode] Sort Colors
Given an array withnobjects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, wh...
分类:其他好文   时间:2014-06-27 12:55:53    阅读次数:235
[leetcode] Add Two Numbers
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single ...
分类:其他好文   时间:2014-06-27 12:21:24    阅读次数:215
Vertica数据库常用管理命令汇总
1.查询数据库是否有等待select * from resource_queues where node_name=(select node_name from nodes order by node_name limit 1) order by queue_entry_timestamp desc...
分类:数据库   时间:2014-06-27 12:03:53    阅读次数:680
[leetcode] Spiral Matrix
Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order.
分类:其他好文   时间:2014-06-27 11:51:13    阅读次数:193
[leetcode] Spiral Matrix II
Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order.
分类:其他好文   时间:2014-06-27 11:40:49    阅读次数:156
LeetCode OJ - Add Two Numbers
题目:You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a sing...
分类:其他好文   时间:2014-06-27 11:38:12    阅读次数:207
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