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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
LeetCode Find Peak Element
1.题目A peak element is an element that is greater than its neighbors.Given an input array where num[i] ≠ num[i+1], find a peak element and return its index.The array may contain multiple peaks, in that...
分类:其他好文   时间:2015-03-15 15:17:57    阅读次数:142
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
sql学习总结(5)——SQL数据库修改技术
5.1数据插入insert into 表名(字段名,字段名,...) values(字段值,字段值,...)5.2数据更新update tablename set columnname1=value1 [, columnname2=value2...] [where condition]注意:一个只...
分类:数据库   时间:2015-03-15 13:35:01    阅读次数:159
1094. The Largest Generation (25) 此题和六度空间一个道理,记录BFS的层次
1094. The Largest Generation (25) 时间限制 200 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue A family hierarchy is usually presented by a pedigree tree where all the nodes on the...
分类:其他好文   时间:2015-03-15 09:34:14    阅读次数:183
[Leetcode]Search Insert Position
Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in or...
分类:其他好文   时间:2015-03-15 02:02:44    阅读次数:92
codeforces432D Prefixes and Suffixes(kmp+dp)
转载请注明出处:http://www.cnblogs.com/fraud/ ——by fraudD. Prefixes and SuffixesYou have a string s?=?s1s2...s|s|, where |s| is the length of string s, and si...
分类:其他好文   时间:2015-03-14 22:58:37    阅读次数:225
存储过程
变量variable:所有mysql变量都必须以@开头.存储过程创建语法create PROCEDURE 存储过程名()BEGIN select * from `user` where `name`='张三'; --执行语句.END调用语法call 存储过程名()删除存储过程drop PROCE.....
分类:其他好文   时间:2015-03-14 21:35:31    阅读次数:165
Oracle删除重复数据的几种常用方法
1.有可区分的主键,其他数据相同select * from 表名 dl where dl.id not in (select min(d.id) from表名dgroup by 重复列)2.重复数据只能通过RowNum、RowId区分的数据select * from 表名 where rowid i...
分类:数据库   时间:2015-03-14 18:29:04    阅读次数:132
SQL递归查询(with cte as)
with cte as( select Id,Pid,DeptName,0 as lvl from Department where Id = 2 union all select d.Id,d.Pid,d.DeptName,lvl+1 from cte c inner jo...
分类:数据库   时间:2015-03-14 16:44:34    阅读次数:181
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