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Oracle,mysql,sqlserver,postgresql语句几点比较
1.分页 Oracle: SELECT * FROM(SELECT A.*, ROWNUM RN FROM (select T.* from sj_receiptinfo t WHERE t.TAXNO LIKE CONCAT('%', CONCAT(?, '%')) order by t.id desc) A WHERE ROWNUM ? mysql:  select * fr...
分类:数据库   时间:2015-03-15 16:53:17    阅读次数:332
Binary Tree Level Order Traversal
Binary Tree Level Order Traversal问题: Given a binary tree, return thebottom-up level ordertraversal of its nodes' values. (ie, from left to right, lev....
分类:其他好文   时间:2015-03-15 16:29:32    阅读次数:119
sql学习总结(6)——索引和视图技术
索引是一种特殊类型的数据库对象,保存数据库表中一列或多列的排序结果,因此有效使用索引可以提高数据的查询效率;视图是从一张表或多张表或视图中导出的表(虚表),为查看和存取数据提供了另外一种方法。索引优点:加速数据检索;加速连接、order by、group by;查询优化器依赖于索引起作用;强制实行的...
分类:数据库   时间:2015-03-15 13:39:48    阅读次数:172
sql学习总结(3)——SQL单表查询技术
基本格式:select [all | distinct] select_listfrom table_list/view_list[where conditions][group by group_list][having conditions][order by order_list]例:sele...
分类:数据库   时间:2015-03-15 13:38:17    阅读次数:189
LeetCode 2 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 digit. Add the two numbers and return it as a link...
分类:其他好文   时间:2015-03-15 07:06:35    阅读次数:100
Print a Binary Tree in Vertical Order
Given a binary tree, print it vertically. The following example illustrates vertical order traversal. 1 / \ 2 3 / ...
分类:其他好文   时间:2015-03-15 02:01:09    阅读次数:134
LeetCode --- 60. Permutation Sequence
题目链接:Permutation Sequence The set [1,2,3,…,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order, We get the following sequence (ie, for n = 3): ...
分类:其他好文   时间:2015-03-15 00:54:34    阅读次数:150
LeetCode --- 59. Spiral Matrix II
题目链接:Spiral Matrix II Given an integer n, generate a square matrix filled with elements from 1 to n^2 in spiral order. For example, Given n = 3, You should return the following matrix: [ [ 1,...
分类:其他好文   时间:2015-03-15 00:52:27    阅读次数:386
LeetCode Sort Colors
1.题目Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, white and blue.Here, we will use the integers ...
分类:其他好文   时间:2015-03-14 23:19:13    阅读次数:238
(简单) LightOJ 1074 Extended Traffic,SPFA+负环。
Description Dhaka city is getting crowded and noisy day by day. Certain roads always remain blocked in congestion. In order to convince people avoi...
分类:其他好文   时间:2015-03-14 23:08:49    阅读次数:189
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