原因同上一篇《标量函数》一样,会导致不可索引,看代码:select EmpNo,LastNamefrom Empwhere Salary * 1.1 > 5000.00应当写为select EmpNo,LastNamefrom Empwhere Salary > 5000.00/1.1
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其他好文 时间:
2015-01-23 12:58:08
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138
Description The highest building in our city has only one elevator. A request list is made up with N positive numbers. The numbers denote at which flo...
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其他好文 时间:
2015-01-23 12:49:27
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212
select if(count(salary) = 0, NULL, salary) as `salary` from (select salary from Employee group by salary order by salary desc limit 1,1) tmpWrite a S....
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数据库 时间:
2015-01-23 06:05:49
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136
Problem Description
The highest building in our city has only one elevator. A request list is made up with N positive numbers. The numbers denote at which floors the elevator will stop, in specifie...
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其他好文 时间:
2015-01-21 18:22:56
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155
文件读写涉及到cPickle这个包。基本的流程在代码中有表述,但是教程中说加一段代码叫做:protocol=cPickle.HIGHEST_PROTOCOL会使得效率大增#!/usr/bin/env python# coding=utf-8import cPicklef=file('obj.txt'...
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其他好文 时间:
2015-01-20 22:02:06
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192
原题链接:https://oj.leetcode.com/problems/remove-nth-node-from-end-of-list/
这道题是移除倒数第n个node,做法是保持2个指针,一快一慢,快指针先走n步,然后快慢指针同时走,直到快指针变成null。这时将慢指针的值改为next的值。(注意,慢指针其实是指针的指针,以为为了改变指向当前node的指针的值)。个人感觉这题其实...
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其他好文 时间:
2015-01-20 17:59:27
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145
6.1 SELECT ... FROM 语句hive> SELECT name,salary FROM employees; --普通查询hive>SELECT e.name, e.salary FROM employees e;--也支持别名查询当用户选择的列是集合数据类型时,Hive会使用 J....
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其他好文 时间:
2015-01-18 22:39:51
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977
Given a linked list, remove thenthnode from the end of list and return its head.For example, Given linked list: 1->2->3->4->5, and n = 2. After re...
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其他好文 时间:
2015-01-17 22:10:06
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282
Question:Givenanumbern,givemeafunctionthatreturnsthenthfibonaccinumber.Runningtime,spacecomplexity,iterativevs.recursive.http://www.glassdoor.com/Interview/Given-a-number-n-give-me-a-function-that-returns-the-nth-fibonacci-number-Running-time-space-complexi..
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其他好文 时间:
2015-01-16 17:06:01
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105
// 每两个为一组包裹起来 var slides2n = $("#frame").find(".phone-screen:nth-child(2n)").each(function(i){ slides.slice(i*2,i*2+2).wrapAll(""); }); //剩下的再用...
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Web程序 时间:
2015-01-16 14:32:30
阅读次数:
205