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1. Background of the problem(1) Student form (school number, name, age, gender)Student (S#,sname,sage,ssex)(2) Course Schedule (course number, course name, teacher number)Course (c#,cname,t#)(3) Score table (School number, course number,

The Nineth chapter in MySQL, limit and not in case I. Project of the case 1. Create a database statement:#创建数据库CREATE DATABASE ' schooldb ';Use ' schooldb ';#创建学生表CREATE TABLE ' Student ' (' Sid ' INT (4) auto_increment not NULL PRIMARY KEY COMMENT '

The InnoDB row format in two formats (compact,redundant) defaults to the compact compact's storage format, and the first part is a non-null, variable-length list of field lengths, and is placed in reverse order, when the length of the column is less

One, the index in MySQL:We have seen the index in the array, and the advantage is that it can be quickly detected by subscript or index;The ability to quickly locate a message;What is the index in 1.MySQL?It is the field that has the index in our

#课程表DROP TABLE IF EXISTS ' course ';CREATE TABLE ' Course ' (' CNO ' char (5) Not NULL,' CNAME ' varchar (ten) is not NULL,' TNO ' int (ten) is not NULL,PRIMARY KEY (' CNO ')) Engine=myisam auto_increment=348 DEFAULT Charset=utf8;-- -----------------

Scene One, data table automatic backup (Multiple tables field synchronization, etc.), using triggers. If Updatelog records all operations logs for a resource, Reslastlog logs information about the last operation of the resource. The synchronization

First, pre-preparation1. Operating system version# Cat/etc/redhat-releaseCentOS Release 6.5 (Final)# Uname–aLinux enc-bigdata05 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 03:15:09 UTC x86_64 x86_64 x86_64 gnu/linux2. Pre-Software preparation2-1. JDK

I. Installation of the SOFTWAREExecutable fileCompress packageWindows: Executable Point-to-point compression package placement of any directory initialization server: E:\WUPEIQI\MYSQL-5.7.16-WINX64\MYSQL-5.7.16-WINX64\BIN\MYSQLD--

I. First, create a test table TableA CREATE TABLE ' TableA ' (' createtime ' int (ten) unsigned not NULL default 0 COMMENT ' createtime ') Engine=myisam auto_incremen T=4 DEFAULT Charset=utf8; Two. Add fields Format: ALTER TABLE tableName ADD

3 ways to divide MySQL tablesFirst, let's talk about why the tables are divided.When a piece of data reaches millions of, you spend more time searching for it, and if you have a joint query, I think it's possible to die there. The purpose of the sub-

In the MySQL database, the MySQL merge table is somewhat similar to the view. Let's take a look at the advantages of the MySQL merge table and hopefully it will help you.mysql Merge Table Benefits: A: Separating static and Dynamic Data B:

Database designin the system design process, the database is also a link can not be ignored, the database design is related to the stability of the system, so each information management, must be designed, the following is the database of the

Reprint Please specify source: http://blog.csdn.net/xiaojimanman/article/details/45694049Http://www.llwjy.com/blogdetail/fa404163e42295646ab6e36e1ddb1037.htmlPersonal Blog Station has been online, the website www.llwjy.com ~ welcome you to vomit

Recently in this sharding-sphere, the company's internal sub-database sub-table is in this business code on the logical sub-database sub-table, but this is always bad, but also research several sub-database sub-table middleware, Mycat, NetEase Cetus,

When the data volume of the database rises to a certain amount, the performance becomes the question which we cannot but pay attention, how optimizes? There are only a few ways to use them: 1, the table, that is, a large number of expression data

Recently engaged in the installation of Cloudera Manager, experienced a lot of frustrations, summed up: Also referred to a number of other people's posts such

In this section, let's look at the partitioning techniques in Mysql (RANGE, LIST, HASH)The Mysql partitioning technique is somewhat similar to the horizontal table, but it is a horizontal table at the logical level, and it is a table for the

The limit for total index length is: The InnoDB internal maximum key length is 3500 bytes, but MySQL itself restricts this to 3072. (1024 bytes for non-64-bit builds before MySQL 5.0.17, and for all builds before 5.0.15.) In the UTF8 character set,

One: For return SQL installation table data, required fields $installer = $this;$installer->startsetup ();$installer->run ("DROP TABLE IF EXISTS ' Return_order ';CREATE TABLE ' Return_order ' (' return_id ' int (a) unsigned not NULL auto_increment

Today continue to see the teacher to recommend the simple and simple MySQL database development This book, see INNODB Database Foreign Key Association problem, encountered a problem, the book is written on the parent table can be modified to sync to