假设现在有一张学生表student,学生表中有姓名、分数、课程编号,现在我需要按照课程对学生的成绩进行排序。
select * from student
1. rank over ()可以实现对学生排名,特点是成绩相同的两名是并列,如下1 2 2 4 5
2. dense_rank()和rank over()很像,但学生成绩并列后并不会空出并列所占的名次,如下1 2 2...
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数据库 时间:
2015-04-16 15:46:25
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139
问题描述
Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.
If the number of nodes is not a multiple of k then left-out nodes in the end should remai...
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其他好文 时间:
2015-04-16 14:22:29
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208
描述:The string"PAYPALISHIRING"is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font...
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其他好文 时间:
2015-04-16 14:11:13
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132
在JQuery中有一个type方法,在1.11.2中是这样写的 1 var class2type = {}; 2 var toString = class2type.toString; 3 jQuery.each("Boolean Number String Function Array Date ...
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Web程序 时间:
2015-04-16 13:56:56
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140
Given a string ‘str’ of digits and an integer ‘n’, build the lowest possible number by removing ‘n’ digits from the string and not changing the order ...
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其他好文 时间:
2015-04-16 11:49:38
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179
Prime LandTime Limit:1000MSMemory Limit:10000KTotal Submissions:3211Accepted:1473DescriptionEverybody in the Prime Land is using a prime base number s...
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其他好文 时间:
2015-04-16 11:45:47
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157
题目链接:Maximum Depth of Binary Tree
Given a binary tree, find its maximum depth.
The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.
这道题...
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其他好文 时间:
2015-04-16 10:25:57
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123
Palindrome Numbers
Time Limit: 2 Seconds Memory Limit: 65536 KB
A palindrome is a word, number, or phrase that reads the same forwards as backwards. For example, the name "anna" is a palind...
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其他好文 时间:
2015-04-16 09:10:30
阅读次数:
143
http://stackoverflow.com/questions/3959692/rownum-in-postgresqlSELECT row_number() OVER (ORDER BY col1) AS i, e.col1, e.col2, ... FROM...
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数据库 时间:
2015-04-16 07:57:38
阅读次数:
129
Given a linked list, reverse the nodes of a linked listkat a time and return its modified list.If the number of nodes is not a multiple ofkthen left-o...
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编程语言 时间:
2015-04-16 06:35:47
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198