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Tags: Document learning ges DDR Select RES data varchar TPS1. Select the database you want to use (select the test database created in the previous article) The existing database Mysql>use test; Select the test database; 2. Create a table 2.1column represents the name of each column, datatype represents the data type of each column (available data type: https://www.w3schools.com/sql/sql_datatypes.asp) 2.2 Creating a Table Mysql> CREATE TABLE Persons (-PersonID int,LastName varchar (255),Firs

A CHECK1.Check constraints are used to limit the range of data that is filled inWhen a check is used on a column in a table, it restricts only the data for that columnWhen check is used for a table2. Syntax: MySQL1. Use check (constraints) directly when creating a table2. Add a check to a table you've created2.1 Single condition　　More than 2.2 conditions　　3. Discard CHECK constraints(vi) MySQL: Learn SQL syntax (check constraints) on W3Schools documen

)3.4FOREIGN key (foreign key)------used to mark a row of this table in another table or this table3.5CHECK------Ensure that a column of data meets a particular condition3.6The default------sets an initial value that is set to this value when the data is not assigned3.7INDEX------used to quickly create and retrieve data from a database4. This is a constraint summary, I'll try these constraints later, (not full,unique,primary key has been tried in the blog that added the primary key)(attached) MyS

Slide switch effect css3 slide switch] Pure CSS3 code sliding switch effect-css3 sliding effect-css3 Slide left and right, css3-css3 Today, I saw a blog post on the css3 event and sorte

Article Introduction: CSS3 gradient are divided into linear-gradient (linear gradients) and radial-gradient (radial gradients). CSS3 released for a long time, now some of the foreign pages can often see his figure, which I envy for a long time, but unfortunately in the country in order to compatible with IE, so that this technology is subject to a lot of restrictions, many Web front-end staff ar

Today, I saw a blog post about the CSS3 incident, and then I sorted out the relevant information on a whim. Click the button to achieve the sliding effect of the switch.Today, I saw a blog post about the CSS3 incident, and then I sorted out the relevant information on a whim. Click the button to achieve the sliding effect of the switch.Today, I saw a blog post about the

CSS3 technology is now becoming more and more mature, with some new features of CSS3 (such as box-sizing, boundary radii, text shadows, gradients, etc.) created to make the front-end developers excited. Using CSS3 for front-end design is the future development trend. Therefore, if you are a front-end designer, you need to master these latest technologies, or you

Web page Production WEBJX article introduction: Five award-winning works in the CSS3 design competition. A CSS3 design competition was organized last month, culminating in the award of 5 designers, which embodies the originality and uniqueness of the CSS3 technique, as well as the powerful features of CSS3, w

Are you dizzy with a lengthy prefix like-moz-border-radius in the CSS3? If you're considering using CSS3 across browsers, remember which ones are supported by which browsers? Have you ever thought of any way to solve these problems once and for all? Don't worry about it, Paul Irish and friends made an interesting CSS3 generator, on which you can edit the

YLBTECH-CSS3:CSS3 rounded Corners 1. back to top 1, CSS3Rounded CornersCSS3 rounded CornersUsing the CSS3 Border-radius property, you can make a fillet for any element.CSS3 Round Corner MakerBrowser supportThe number in the table represents the version number of the first browser that supports the property.The number in fron

In this chapter, I will introduce some new CSS3 properties in order to show the code conventions used in this book, but I would like to briefly explain the history of CSS3. I think you don't need to know its history in order to use CSS3, but I think it's important to have some background about the current state of CSS3

Web page Production WEBJX article introduction: CSS3 target Pseudo class introduction. The CSS3 target pseudo class is one of many useful CSS3 features. It is used to match the target element of a marker in the URI of the document (page). Specifically, a marker in a URI usually contains a "#" character followed by a name of a marker, such as #respond,t

Web page Production WEBJX article introduction: two online debugging css3.0 tools, CSS3 please and CSS3 generator. Two online debugging css3.0 tools,CSS3 please and CSS3 generator. Css3.0 added new properties such as projections, gradients, rotations, rounded corners, and so on! These new standard attribut

First to show you the effect map, interested friends can download the source Oh. Effect Demo Source Download Digital clocks can be applied to some Web countdown effects, Web alarm effects, and web-based apps based on HTML5, and this article will show you how to use CSS3 and HTML to make a very nice digital clock effect without any pictures. Html We first prepare a clock area #clock in the page, and the number to display is placed in the. digits.

Article Introduction: 11 Utilities/Resources for better CSS3 development. A cascading style sheet is a style language that describes the expression semantics or the appearance and formatting of a document written in a markup language that can also be HTML or can be used in an XML document. CSS3 is divided into several separate files to become modules, each module also has different extension ca

Web page Production WEBJX article introduction: recently spent a lot of time to clean up the CSS3 special effects, using a more intuitive and understandable way to share with you, I hope you will have a little harvest. Recently spent a lot of time to clean up the CSS3 special effects, using a more intuitive and understandable way to share with you, I hope you will have a little harvest. "-moz-"

CSS3 of the Times, css3--animation is all possible; The traditional JS can judge whether the animation is finished by the callback function, even if the animation effect is generated by CSS technology, JavaScript can still capture the animated or transformed end event. Transitionend Event and Animationend event standard browser events, but in WebKit browsers you still need to use the WebKit prefix, so w

This article brings you to the content is about CSS3 how to achieve text gradient? CSS3 realize the text gradient of three methods (code), there is a certain reference value, the need for friends can refer to, I hope to help you. In the development process, the UI designer will often design some with the gradient text of the design, to our programmers, and our programmers, most of them are silently sigh,

Article Introduction: CSS3 make small fresh navigation. HTML structure CSS Code There's nothing to comment on. A {text-decoration:none!important;outline:none!important;}Body {Background:rgb (245,245,245);} . Nav {margin:50px Auto;Text-align:center;width:591px;height:41px;BORDER:1PX solid;Border-color:rgb (181,181,181) RGB (235,235,235) RGB (236,236,236) RGB (235,235,235);border-radius:2px;padding:1px;Background:rgb (240,240,240);box-sh

Javascript judges the callback function of css3 animation end css3 animation end, css3 callback function In the css3 era, css3 -- animation is all possible; Traditional JavaScript can use callback functions to determine whether the animation ends. Even if CSS technology is