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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

The seoer who have had some experience are clear, SEO can be divided into two kinds of strategy: white Hat and black hat, these two different strategies to use the ratio is probably 6:4, that is to say, most seoer or will be more fond of white hat seo, because they think that Black hat seo is by cheating means to get ranked, Do not have any technical value, not w

SEO (Search Engine optimization, SEO) is a way to use search engines to improve the purpose of the site in the search engine rankings. Deep understanding is: Through SEO such a set of marketing ideas based on search engines for the site to provide eco-style marketing solutions, so that the site in the industry leading position, so as to gain brand revenue. Resear

At present, many enterprises recruit network optimization personnel are anxious to see the next second results, do three days after the boss will see the real effect, that is the site keywords and rankings, and as the seoer pressure that is self-evident, the boss every day in the back to urge you to effect, and SEO is not three days can be effective, This is a long-term adherence to the process, the effect is not likely to immediately appear, this is

It seems that the two sentences have the same meaning. However, this contains two aspects of the content. One is to SEO and SEO is just to do SEO only. For the ranking of the site to do SEO that is a kind of thinking. Below, useless SEO and everyone to discuss these two topi

The site's SEO diagnosis is a branch of SEO services, before the special proposed, but in fact already exist, such as SEO consultants to provide advice to the site when the SEO will be diagnosed, SEO diagnosis for the diagnosis of professional knowledge reserve requirements

1. What is SEO SEO is known as Search Engine optimization, Chinese is search engine optimization, it is for the search engine site collection and evaluation rules, the structure of the site to make reasonable adjustments to the content of the page and the page to do some more adapted to the principle of the search engine, mainly including the title of the Web page, Description and so on, so that each page

Fall Maple Loven Tracking and finishing the Zac in billion Power SEO interview, in this share with you: 　　SEO Question one: Little brother has three questions to ask Brother One, micro-blog marketing has no impact on Baidu? Second, the role of 301 steering is what, if the site is K, and then 301 to turn, is not Baidu will be reproduced site? When does the Chinese version of the elder brother come o

In today's hot market for SEO, more and more SEO practitioners to get rid of the title to meet the search engine's appetite, as the saying goes, extremes, in the next few years, the search engine will be more and more intelligent, All for SEO and to change the title of the situation believe will let search engine feel disgusted, then,

at the beginning of the July 2011, in the Internet SEO industry to change, in the SEO industry appeared a "demon", SEO this in Baidu index of 10000 or so, do this word is to show their own in the SEO aspects of the cattle, in the past, In the SEO industry famous seowhy stabl

Recently, in the industry site to see a "SEO several major crimes" article, the article in the thought of writing so I feel very deep. I will not agree with his point of view, just sigh, why SEO will be judged by people like this? What is the cause? And at present, there are a lot of people in the SEO, I do not understand a person to a thing or a product of disgu

At present, a variety of domestic SEO training throughout the network. But overall, SEO training effect is passable, have Bo friend said: "I participated in several times (SEO) training did not learn what". 　　 Baidu, a variety of SEO training really many I think that the reason for this problem is the fir

Hello everyone, I am Liang Lei, SEO is still a more popular industry, often some new people to consult me now how to learn how to SEO, say sentence to dig heart-to-heart, SEO is not a good prospect now. Of course, this is the author's personal feelings, can not represent anything, but first of all to those who want to learn S