MySQL

1. mysql Add new User:Insert into Mysql.user (host,user,password,ssl_cipher,x509_issuer,x509_subject) VALUES ("xx.xx.xx.xx", "XIAOMIN.WXM" , Password ("WXM"), ', ', ', '); Query OK, 1 row affected (0.10 sec) 2. Authorize the user.  //log in to

Steps for Database design① Demand Analysis② Logic DesignLogical modeling of a database using ER diagrams③ Physical Design④ Maintenance OptimizationA. New requirements for the building of a tableB. Index optimizationC. Large table splitting"Demand

explain SyntaxEXPLAIN SELECT ... Variant: 1. EXPLAIN EXTENDED SELECT ... "Decompile" The execution plan into a SELECT statement, run show WARNINGS to get the query statement 2 optimized by the MySQL optimizer. EXPLAIN Partitions SELECT ... Explain

/*TriggerTrigger Basic Syntax:Create trigger trigger name [Before/after] [insert/update/delete] on table nameFor each rowBeginTrigger BodyEnd*/Example one (for reference only)CREATE TRIGGERTrigger NameAfter insert onTable nameFor each rowBEGIN 　　

I. Reasons for MySQL sub-table1, when a piece of data reached millions of, you query the time spent will be more, if there is a joint query, I think it might be dead there.The purpose of the sub-table is to reduce the burden on the database and

This article mainly introduces the Nodejs operation MySQL Database example, this article demonstrates how to create a MySQL connection in Nodejs, MySQL database, insert data, query data and other functions, the need for friends can refer to the

Sometimes because the code needs to modify the MySQL code, Windows modification has a simple graphic interface, Linux people can refer to the following methodsThe default login to MySQL allows you to view system variables and their values through

1. A character set is a collection of characters and their encodings to see the character sets supported by the databasecharacter Set2. View the default character set when the server startsMysql>Show variables like 'character_set_%';+----------------

MySQL Storage engineMySQL database has many kinds of storage engine, different engine features different, have their own advantages. I've been looking at the MySQL Technology insider, just taking notes.InnoDB Storage EngineThis is the default

It is well known that the Mysql5.1.46 default engine is MyISAM, so how do I turn on the InnoDB engine? I have a lot of errors in installing the database and turning on the InnoDB engine, we will list them for your reference only.1. System

★mysql Index ALTER TABLE to create a normal index, a unique index, or a primary key indexALTER TABLE table_name ADD index index_name (column_list)ALTER TABLE table_name add unique index_name (column_list)ALTER TABLE table_name ADD primary

1, the requirements are as followsConsignee delivery address order number user IDZhang San Beijing 1001 1Zhang Four Shanghai 1002 2Zhang Five Beijing 1003 3Zhang six Guangzhou 1004 4Zhang San Shenzhen 1005 5Zhang Seven Shanghai 1006 6There is now

SERIAL is an alias of BIGINT UNSIGNED not NULL auto_increment UNIQUE .In the integer column definition,SERIAL DEFAULT VALUE is an alias of not NULL auto_increment UNIQUE .Note: The above not NULL is not nullable, auto_increment is incremented, the

Python learning-installing mysql-python module and mysqlpythonwindows in windows I recently learned how to use Django. I saw that mysql-python module is required to connect to the database. Then I went to download the package. I started to use pip

Mysql backup data migration and error handlingAll data files in/usr/lib/mysql are left behind in the project history. Previously, MyISAM engine of mysql5.1 In Debian was used. The current machine is ubuntu, and only mysql5.5 is used. mysql5.6

MySQL modifies the copied user and password In the production environment, you sometimes need to modify the password of the copied user account, for example, the password is lost, or because multiple different copied users want to be a single copy

MySql storage engine notesMySql storage engine MySql Databases have many storage engines. Different engines have different features and have their own advantages. I recently read the MySQL technology insider, just taking notes.InnoDB Storage Engine

MySQL 5.7 native JSON format In the comparison between MySQL and PostgreSQL, the advantages of PostgreSQL JSON format support are always compared. In fact, MariaDB also stored unstructured data earlier, known as dynamic column, but the solution is

A serious risk of mysql using both orderby and limit queries-data loss I often use order by and limit to display and sort data by PAGE, and I have never found any problems. However, there was a serious problem during the past two days. When the data

Install mysql using yum in centos Speaking of databases, we mostly think of relational databases, such as mysql, oracle, and sqlserver. These database software is very convenient to install on windows. If you want to install a database on Linux, we