码迷,mamicode.com
首页 >  
搜索关键字:distinct    ( 3361个结果
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 1269 两线的关系
Intersecting LinesTime Limit:1000MSMemory Limit:10000KTotal Submissions:10967Accepted:4930DescriptionWe all know that a pair of distinct points on a p...
分类:其他好文   时间:2014-08-18 20:11:22    阅读次数:244
N-Queens II
Follow up for N-Queens problem. Now, instead outputting board configurations, return the total number of distinct solutions. public class Solution { public int totalNQueens(int n) { ...
分类:其他好文   时间:2014-08-18 10:49:54    阅读次数:206
distinct group by 去重查询
select * from dc_restaurants; 31 select DISTINCT (restaurant_name),id from dc_restaurants; 31 (会按照id和 restaurant_name 联合 去重 )select DISTINCT (restaur....
分类:其他好文   时间:2014-08-18 10:46:03    阅读次数:199
DBA Scripts
标记一下,慢慢研究 http://www.oracle-base.com/dba/scripts.php Monitoring access.sqlactive_sessions.sqlcache_hit_ratio.sqlcall_stack.sqlcode_dep.sqlcode_dep_distinct.sqlcode_de...
分类:数据库   时间:2014-08-16 23:51:01    阅读次数:616
hdu 3934&&poj 2079 (凸包+旋转卡壳+求最大三角形面积)
链接:http://poj.org/problem?id=2079TriangleTime Limit:3000MSMemory Limit:30000KTotal Submissions:8173Accepted:2423DescriptionGiven n distinct points on ...
分类:其他好文   时间:2014-08-16 17:07:40    阅读次数:284
Distinct Subsequences
Given a string S and a string T, count the number of distinct subsequences of T in S.A subsequence of a string is a new string which is formed from th...
分类:其他好文   时间:2014-08-16 12:23:50    阅读次数:221
[LeetCode] Subsets (bfs的vector实现)
Given a set of distinct integers, S, return all possible subsets.Note:Elements in a subset must be in non-descending order.The solution set must not c...
分类:其他好文   时间:2014-08-15 17:18:39    阅读次数:177
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!