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数据库查询习题整理(二)
--26、查询存在有85分以上成绩的课程Cno. 需要用distinct除重select distinct cno from score where degree>85--27、查询出“计算机系“教师所教课程的成绩表。三个表join起来,筛选条件depart为计算机系select score.cno...
分类:数据库   时间:2014-09-09 22:58:19    阅读次数:835
ORA-00933 UNION 与 ORDER BY
原文:http://blog.csdn.net/lwei_998/article/details/6093807The UNION operator returns only distinct rows that appear in either result,while the UNION ALL...
分类:其他好文   时间:2014-09-09 15:53:08    阅读次数:240
leetcode 之 Distinct Subsequences
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 the original string b...
分类:其他好文   时间:2014-09-06 22:37:44    阅读次数:208
SQL基础 利用SELECT检索数据
SELECT [DISTINCT|ALL]SELECT_LISTFROM TABLE_LIST[WHERE+CLAUSE][GROUP_BY_CLAUSE][HAVING CONDITION][ORDER_BY_CLAUSE]使用别名代替数据库中的字段名(AS可去除用空格,但不利于阅读)SELECT...
分类:数据库   时间:2014-09-05 23:33:42    阅读次数:261
mysql 全文检索的匹配问题
开发过程中碰到一个关于mysql 全文检索的问题,控制台打印的SQL语句拿到数据库里执行,结果不对。后来发现原来是少了双引号。下面是网上找到的资料,我是看到这个才意识到自己的问题。这是之前在数据库执行的SQL语句,检索结果上万条。SELECT DISTINCT c.Rm_Code, c....
分类:数据库   时间:2014-09-05 12:40:21    阅读次数:223
Leetcode: Distinct Subsequences
DP新思路,不同于以往的DP做法
分类:其他好文   时间:2014-09-05 05:31:20    阅读次数:269
poj 2299 Ultra-QuickSort(树状数组)
DescriptionIn this problem, you have to analyze a particular sorting algorithm. The algorithm processes a sequence of n distinct integers by swapping ...
分类:其他好文   时间:2014-09-04 13:08:20    阅读次数:185
LeetCode: Subsets
LeetCode: SubsetsGiven a set of distinct integers, S, return all possible subsets.Note:Elements in a subset must be in non-descending order.The soluti...
分类:其他好文   时间:2014-08-31 22:53:32    阅读次数:250
Climbing Stairs <LeetCode>
You are climbing a stair case. It takesnsteps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb...
分类:其他好文   时间:2014-08-31 14:22:31    阅读次数:219
Subsets系列
SubsetsGiven 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...
分类:其他好文   时间:2014-08-28 17:58:05    阅读次数:356
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