--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...
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数据库 时间:
2014-09-09 22:58:19
阅读次数:
835
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...
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其他好文 时间:
2014-09-09 15:53:08
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240
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...
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其他好文 时间:
2014-09-06 22:37:44
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208
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...
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数据库 时间:
2014-09-05 23:33:42
阅读次数:
261
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....
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数据库 时间:
2014-09-05 12:40:21
阅读次数:
223
DescriptionIn this problem, you have to analyze a particular sorting algorithm. The algorithm processes a sequence of n distinct integers by swapping ...
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其他好文 时间:
2014-09-04 13:08:20
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185
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...
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其他好文 时间:
2014-08-31 22:53:32
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250
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...
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其他好文 时间:
2014-08-31 14:22:31
阅读次数:
219
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...
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其他好文 时间:
2014-08-28 17:58:05
阅读次数:
356