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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

)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

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no semantics: it is also an empty element used to create a split line in a page that can be implemented in CSS, so it is not used in HTML. Common entity characters in the code how to write: Spaces: with the #160即可实现; less than the symbol: Comparison priority: Each declaration has a priority. When a conflict occurs, the priority is retained and the lower priority is eliminated. Among them (important this is an important statement, there is no ord

Section II Learning about formatting tags and text markersStart learning formatting tagsFlash birdFlash Bird Paragraph LearningFlash Bird Paragraph LearningParagraph learning of Flash bird paragraphList Item Markers | (normal arrangement)Unordered listOrdered listFlash Bird horizontal Divider Learning Flash Bird horizontal Divider Learning HN Title TagFont tagThe font size is 1 to 7, the browser defaults to 3, and the font can be set to color and font styleB MarkI mark22Learn

1. You can combine HTML elements with 2.HTML block ElementMost HTML elements are defined as block-level elements or inline elements.Editor's note: "Block-level elements" are translated as block levels element, "inline elements" translated into the inline element.Block-level elements usually start (and end) with a new line when the browser is displayed.Example: 3.

about HTML, absolute positioning, relative positioning of the understanding ... (Learn small records in HTML process) Wang Coli (Star stars)In HTMLrelative positioning: position:relative;absolute positioning:position:absolut;1. Relative positioning (the relationship between Div and Div)Body tag is actually a large box, inside the body set two boxes Div1 and Div2,

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The properties of 1.HTML are always specified in the start tagFor example, the HTML link is defined by the 2. More examples of HTML attributes:***3. The attribute writing proposal is lowercase; always enclose the value of the attribute (if the property itself has double quotation marks, use a single quotation mark outside)HTM