SQL, Federated primary Key, group by ID to find a collection of the maximum version number

The table structure is as follows:/*sqlyog v10.2 MySQL-5.5.39 **********************************************************************//*!40101 SET NAMES UTF8*/;Create Table' seal ' (' ID ')varchar( the), ' Update_user 'varchar( the), ' Update_time

T-SQL case nested case

SELECTJournalentryid, Journalentryno, Capitalchain, DataSource, Entrysummary, Accountsubject, CaseAccountsubject when ' Accounts payable ' Then ' Carmen network supplier ' when ' Accounts receivable ' Then ' Carmen Customer '

Analysis of SQL statement optimization techniques

Excerpted from http://www.cnblogs.com/wxj1020/archive/2008/04/27/1173638.htmlI have been training in the database in recent weeks and I have benefited greatly from the excellent technical and vivid explanations of our teachers. In order to let more

Maven+spring Batch+apache Commons VF Learning

Apache Commons VFS Data:Example: http://www.zihou.me/html/2011/04/12/3377.htmlDetailed Example: http://p7engqingyang.iteye.com/blog/1702429Apache Commons VFS: File system Tools, do not come from the file system with different files to operate, can

Ultra-quicksort (tree-like array + discretization)

ultra-quicksort POJ 2299 Time Limit: 7000MS Memory Limit: 65536K Total Submissions: 50495 Accepted: 18525 Descriptionin this problem, you has to analyze a particular sorting algorithm.

National Water Quality Query API query water quality according to watershed

The National water quality Query API is based on the watershed query water quality, including monitoring site, ph, ph category , dissolved oxygen, dissolved oxygen quality category, ammonia nitrogen, ammonia nitrogen water quality category,

Delphi uses WebBrowser to login QQ Group documents

UnitUnit1;InterfaceusesWindows, Messages, sysutils, variants, Classes, Graphics, Controls, Forms, Dialogs, Stdctrls, Olectrls, Iebrowser, Mshtml;typeTForm1=class(tform) Label1:tlabel; Edit1:tedit; Label2:tlabel; Edit2:tedit;

Ok6410 Bare Metal Drive Learning (i) Development tools

1.GCC tool Chain1.GCC file types processed by default File type Extended Name Document description Text file *.c C Language Source files *. C, *.cxx, *.cc C + + source files

leetcode@ [139/140] word break & Word break II

https://leetcode.com/problems/word-break/Given A string s and a Dictionary of words dict, determine if s can segmented into a space-s Eparated sequence of one or more dictionary words.For example, givens = "leetcode" ,dict = ["leet", "code"] .Return

GetLastError to get the error message into a text description

We usually use GetLastError to get the error message after calling some APIs, but the information is integer, do we know what it means?Hey, yes, there is MSDN Ah, of course, you can also use the FormatMessage function.Just looked at the Windows core

Common coding for baseband transmission

AMI encoding1 yards is usually called the pass number, 0 yards is called the empty number, this is used in the early telegraph communication in the name. From the morphological perspective, it is a three-state signal, so the AMI code is a

Installing OPENJDK 8

1.JDK 8 Example(1.1) Debian, Ubuntu, etc. use the following installation commands:sudo Install openjdk-8-jreThe PS:OPENJDK-8-JRE contains only the JRE, and if you need to develop a Java program, you need to download OPENJDK-8-JDK(1.2) Fedora, Oracle

Parallax Response animation slide picture Toggle Effect

This is a very powerful content switch plug-in, it is based on jquery, it is fully responsive to support mobile devices, support mobile phone touch, keyboard paging; it has a slideshow, video playback timer, it has a variety of modes: custom,

Spoj 1557. Can you answer these queries II segment tree

Can you answer these queries IITime Limit:20 SecMemory limit:256 MBTopic Connectionhttps://www.spoj.com/problems/GSS2/DescriptionBeing a completist and a simplist, kid Yang Zhe cannot solve but get wrong Answer from most of the OI problems. And he

How to use free controls to import data from a Word table into Excel

I usually use MS Excel to store and process large amounts of data, but sometimes I often encounter a problem-the data i need is stored in a Word table, not in Excel, which is cumbersome to handle, especially when the data is huge.At this point, I

bzoj:1673: [Usaco2005 dec]scales balance

DescriptionFarmer John had a balance for weighing the cows. He also have a set of n (1 John has a balance to weigh the cows. It is supplied with N (1≤n≤1000) weights of known weights (all weight mass values are in 31-bit binary). Each time the cow,

Operating system:three Easy Pieces---locks:test and Set (Note)

Because disabling interrupts does not work on multiple processors, system designers started toInvent hardware support for locking. The earliest multiprocessor systems, such as the BurroughtsB5000 in the early 1960 ' s, had such support; Today all

"Reprint" IE8 inline-block container does not open up the problem (using redraw solution)

Encounter problems-Analyze problems-solve problems.Browser compatibility problems just came up, and today there's a IE8 problem. When the content increases, the container does not open. Let's take a look at the details below.Encounter

Advanced Mathematical Statistics (IV.)

Introduction"A more official introduction" Mathematical statistics is a subject based on probability theory and highly applied. It studies how to collect, collate and analyze the data with randomness in an effective way so as to make the correct

is the power supply of Poe switches as large as possible?

Poe switches are widely used, especially network monitoring and wireless coverage, because they can be powered by a network cable, subtract additional cabling, and make construction easier.In the Network Monitoring project, a monitoring system has a

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