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I am a newbie. I have been confused for a long time. Today I decided to ask you the correct or common practices. Here is a simple example: id, title, content ,...... Label table: id. The two tables above the title obviously require auto-incrementing IDS as the primary key to ensure uniqueness. Design 1 next... I am a newbie. I am confused about this question for a long time. Today I decided to ask you the correct or common practices. A simple example

The C++14 standard has recently been passed, as before, without much change to the language, and the C++14 standard is to make it easier for programmers to program by improving C++11, c++11 introduce the Auto keyword (strictly speaking, auto starts with C + + 03, just C + + 11 changed the meaning of auto), Auto makes y

Auto specifier(from c++11)C + + language declarationFor a variable, the specified type is automatically deduced from its initializer.For a function, specify whether its return type is a trailing return type or will derive from its return statement (C++14). For non-type template parameters, the specified type is deduced from the parameter. (from c++17)Grammar Auto variable initia

OneautoKeywords in previous livesStarting with the C language, the auto keyword is treated as a storage type modifier for a variable that represents an automatic variable (local variable). It cannot be used alone, or the compiler will give a warning. #include int main () {int a = 123 Span class= "K" >auto int b = 234 Span class= "K" >auto c = 345printf (\n" Span

Turn from: hereA. Introduction to AutoWhen programming, it is often necessary to pay the value of an expression to a variable, and it is necessary to know clearly what the variable is when declaring the variable. It's not that easy (especially in templates) to do that, but sometimes it doesn't. To solve this problem, the c++11 new standard introduces the auto type specifier, which allows the compiler to parse the type that the expression belongs to. i

Swift language auto layout Getting Started Tutorial: PreviousStart thinking in the form of automatic layout constraints!Update record: This tutorial was updated by Brad Johnson for Swift and iOS 8, with the first version of the author being the Matthijs Hollemans of the tutorial compilation group.Have you ever been bothered by the app's ability to display a neat interface in both portrait and landscape mode? Have you ever been upset about the layout s

adding videos on the Web page often does not automatically play, how to achieve automatic playback of video This is a lot of friends want to solvethe problem. After collecting and researching, we find several ways to realize the automatic play of video, for reference, learning,use! common code that videos are added to a Web page:keurls= "false" quality= "High" allowscriptaccess= "Never" allownetworking= "internal "allowscriptaccess=" never ">One, 56 albums video automatic playback method:Find th

processing of strings. For example://Defines a string variable that holds the user name entered by the userString strName ="";cout "endl; // get user input string and save to strname variable Cin>>strname; ////if (Strname.length () 6// " error: User name contains at least 6 characters "endl;} In the above code, we first define a string variable strname, which holds the user-entered user name string, and then uses CIN to get the user-entered string and save it to the strname variable.

The powerful traditional industry is like a vast ocean, it is easy to absorb the new Internet into its own body. But from these traditional industries in the ocean accidentally will evaporate a little steam, when the water vapor hits the internet, they melt into a pearl, or crystal clear or radiant. In some industries, we have seen such pearls, beautiful people such as Ctrip, Art Dragon, 51job, and yet to be further processed and polished such as Sunco real estate, search rooms, Chinese elite,

XML query in SQLSERVER: FORXML specifies AUTO preface. In SQLSERVER, RAW, AUTO, EXPLICIT, and PATH can be specified for XML query. This article uses some examples to introduce the XML query of AUTO in SQLSERVER. Basic example Segment 1: withTestXmlas (select1asid, NLeeWhoeeUniversityasnameunionall XML query in SQL server: for xml specifies

As one of the heavy International Auto Show, the Shanghai Auto Show has been formally closed on 28th, incomplete statistics, the exhibition during the reception of nearly 260,000 spectators, on-site car purchase and booking 16,000 vehicles, sales amount of nearly 2.43 billion yuan.Wen/Zhang ShuleTMT industry observers, game industry commentators, People's daily, people's Posts and telecommunications column

Attention: Also to learn a ↑↑↑↑ Such a box of fragments is not from the original book , but my own understanding.Item 2 Understand Auto Type deduction-AutoType deductionBefore C++11, theauto keyword has been used to declare variables for the automatic storage type, with virtually no practical role, status and export Keyword (used to export a template outside of the compilation unit, and is also canceled in c++11).In the c++11,

When you insert A piece of data in Table A and insert data in Table B, you need to add the auto-increment corresponding to the corresponding field in table A. How do you get the auto-increment of Table? Next, we will introduce the auto-increment in MySQL. MYSQL obtains the auto-incremental ID in four ways. 1. selectmax

First, the meaning of autoProgramming often requires assigning the value of an expression to a variable, which requires a clear understanding of the type of the expression when declaring the variable, and then it is not easy to do so. To solve this problem, the c++11 new standard introduces the auto type specifier, which allows the compiler to parse the type that the expression belongs to.Second, auto usage

The auto introduced in C++11 has two main purposes: automatic type inference and return-value placeholder. The semantics of the identity temp variable in auto in C++98, which has been removed in c++11 because of its minimal use and redundancy. Front and back two standard auto, completely two concepts1. Automatic type inferenceAuto automatic type inference, which

XML query in SQL SERVER: FOR XML specifies AUTO Preface In SQL SERVER, you can specify RAW, AUTO, EXPLICIT, and PATH for XML queries. This article uses some examples to introduce the XML query of AUTO in SQL SERVER. Basic example Section 1: With TestXmlAs(Select 1 as id, N 'leewhoeeuniversity 'as nameUnion allSelect 2, N 'depop'Union allSelect 3, null)Select id

Original works, reprint please indicate: http://blog.csdn.net/Xiejingfa/article/details/50469045 As anyone familiar with the scripting language knows, many scripting languages introduce "type auto inference" techniques: For example Python, you can declare variables directly, and type check at runtime. With the release of the C++11 standard, the C + + language also introduces the function of type automatic inference, which is the

-levelThe auto Type specifier It is not uncommon to want to store the value of an expression in a variable. To declare the variable, we had to know the type of the. When we write a program, it can be surprisingly difficult–and sometimes even impossible–to determine the type of a expres Sion. Under the new standard, we can let the compiler figure out the type for us by using the auto type specifier. Unlike t

Limitations of Innodb and Myisam storage engines on auto_crement: The auto-increment column in Innodb must be the index and the first column in the index. Otherwise, the following error will be reported: there can be only one column and it must be defined as a key; myISAM does not have this restriction. MyISAM adopts the table lock design, so you do not need to consider concurrency issues for self-growth; How auto_increment works in Innodb: A table co

Get started with Auto Layout for iOS development As the iPhone 6 and iOS8 approaches, the adaptation issues become more complex. I recently learned how to use Auto Layout and shared it with you. What is Auto Layout? Auto Layout is a brand new Layout feature introduced after iOS6 release. Its purpose is to make up for