2015-10-20 SQL Second Lesson (constraint, date, isnull, case, exists, Cast\convert, index, view, stored procedure, trigger, backup and restore)

Label:1,Primary KeyConstraintsThere are five types of constraints in SQL Server, Primary key constraints, Foreign key constraints, Unique constraints, Default constraints, and Check constraints.There is often a combination of one or more columns in

With 1 points, 5 points, 10 points, 25 points, 50 cents coins into one yuan, a total of several combinations of methods? (SQL Puzzles)

Label:As early as itpub saw a SQL expert, like the puzzle, the following is a puzzle. I tried SQL Server to resolve this issue.With 1 points,5 points , 10 points , 25 points , 50 cents coins into one yuan, a total of several combinations of methods?

URI parameter Signature Algorithm "reprint"

Label:IntroductionWhen the application sends an open API call request based on an HTTP POST or HTTP GET request, the Baidu rest server uses a parameter signing mechanism to ensure secure communication between the application and the Baidu rest

ARP protocol

Label:ARP ProtocolOriginal address: Http://blog.csdn.net/tigerjibo/article/details/7351992#t4Preface: ARP the role of the Protocol:1. What is ARP?The ARP (address Resolution Protocol) is a resolution protocol. The most straightforward statement is:

DjVu Turn PDF

Label:Ma JianEmail:[email protected]Published: 2009.09.22Update:2012.06.11The relevant content has been updated for the new progress of Pdftoy.1 Introduction2 theory3 implementationConversion of 3.1 MRC model3.1.1 Single layer DjVu3.1.2 3 Floor DjVu3

OCR modules in the MODI

Label:Ma JianEmail:[email protected]Published: 2012.07.02Update:2012.07.09Supplemental non-Simplified Chinese version contentSince the release of Modi-based Djvutoy, Freepic2pdf, and Pdg2pic, many people are asking the same question: Can you not

uva11426 GCD Extreme (II)

Label:Test instructions: Sum (gcd (i,j), 1<=i<j<=n)1<n<4000001Ideas:1. Establish a recursive relationship, S (n) =s (n-1) +gcd (1,n) +gcd (2,n) +......+GCD (n-1,n);2. Set f (n) =gcd (1,n) +gcd (2,n) +......+GCD (n-1,n).GCD (X,n) =i is

JTA Knowledge

Label:JTA Knowledge (reproduced original address: http://blog.csdn.net/it_man/article/details/7230215)Java Transaction API, translated into Java transaction API. JTA allows applications to perform distributed transactions-access and update data on

What is an XA transaction

Label:What is an XA transactionDistributed transaction processing refers to a transaction that may involve multiple database operationsThe key to distributed transaction processing is that there must be a way to know all the actions that a

OpenSSL, OpenSSH upgrade

Tags: Version upgrade OpenSSL, openssh version upgradeNote: Be sure to first install yum-y installed gcc* make perlpam pam-devel zlib-devel openssl-devel These packagesNote: Install the OpenSSH version to reach more than 6.8, or at least a moderate

Signal and System

Label:Daniel is a very popular introduction to the "Signal and system"Lesson one what is convolution convolution what's the use of Fourier leaf transform what is Laplace transformIntroductionMany friends and I like, engineering electronics major,

Fengtang's poems

Label:1, "Spring is born, Chun Lin in the first Sheng, wind ten miles, as you." --Fengtang "36 Big"2, really put down, go to the ICU or graveyard, you easy to understand, you have to get too much, again to be greedy, too little time, good fun things

Image processing jpg png gif svg

Label:JPG image formatHigh compression, in addition to text, lines, with JPG processingGIF image formatHigh compression, motion diagramPNG image formatPNG is a portable Network image format. PNG initially combines GIF and JPG two to replace both

Dukuwiki Simple Tutorial

Label:===== Please read the instructions below to help you get started quickly =====* DokuWiki (also known as our usual wiki) supports a number of simple markup languages to make the document look friendlier to the fullest possible extent.* You can

hdu5504 GT and sequence (Bestcoder Round #60)

Tags: water BCGT and SequenceTime limit:2000/1000 MS (java/others) Memory limit:65536/65536 K (java/others)Total submission (s): 334 Accepted Submission (s): 85Problem descriptionyou is given a sequence of N Integers.You should

Responsible for breathing, the way to change the air purifier

Tags: environmental protection650) this.width=650; "Src=" https://mmbiz.qlogo.cn/mmbiz/ Ruqiapclr2r16dnlqhipkttqicib954cliaglz8nsqnk3iayiyrufptwe3naicyibwtvfnno6hoiqsiektfy4bc5g7sna/0?wx_fmt=jpeg " Style= "Height:auto;" alt= "0?wx_fmt=jpeg"/>In

QT Programming

Tags: multiple1. With STL corresponding QT library has its own container class:qvector<t>, qlist<t>, qlinkedlist<t>, qstack<t>, qqueue<t>, QMap <K,T>, qhash<k,t>, etc.The basic operation of the container of

ODOO9 Release Notes

Label:October 1, 2015, the long-awaited Odoo9 officially released. This article is Odoo9 official release notes, based on official website data translation.Translator: Suzhou-Micro DustOriginal address:

Chromium's backtrace record

Label:FFmpeg after processing the video stream, the upper WebRTC call error, you can see the WEBRTC call process:BackTrace:Webrtc::rtpfragmentationheader::copyfrom [0x5813cad2+18] (d:\workspace\chromium_build\src\third_party\webrtc\

Types of HotSpot VM GC

Label:Collector speciesThere are four types of GC in HotSpot VM 5.0:incremental (sometimes called train) low pause collector has been deprecated, not introduced. Category Serial collector Parallel collector( throughput

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