MySQL

First, ask: if there is a table, there is a field ID of the self-increment primary key, when the table has been inserted 10 data, deleted the ID of 8,9,10 data, and then restart the MySQL, and then insert a data, then the data ID value should be how

Section I.       connection to the database1. Start the database service650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/50/C8/wKiom1RitYHxoGBgAADQf9E_mvg729.jpg "title=" 1.png " alt= "Wkiom1rityhxogbgaadqf9e_mvg729.jpg"/>which MySQL is

Section I.       connection to the database1. Start the database service650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M01/50/C8/wKiom1RitYHxoGBgAADQf9E_mvg729.jpg "title=" 1.png " alt= "Wkiom1rityhxogbgaadqf9e_mvg729.jpg"/>which MySQL is

The following article mainly describes the actual operation of the MySQL show index syntax and its actual view of the index State (syntax) description of the specific content, if you are curious about this technology, the following article will

SQL Common statements: First, common keywords:1.distinct: Filter RepeatSelect distinct create_user_name from Bms_project; In this case, it is necessary to use the distinct filter out duplicates.2.count: StatisticsSelect COUNT (*) from Bms_project;

installation of MySQLThere are generally three ways to install a software:1, use RPM to install. This package must end in. RPM to be installed using the RPM package.2. Install using the Universal binary format. Just use this installation method the

CREATE PROCEDURE' up_truncate_all_table ' ()BEGIN DECLAREDoneINT DEFAULT 0; DECLARETnameCHAR( -); DECLARECur1CURSOR for SELECTtable_name fromInformation_schema. TABLESWHERETable_schema= 'db_name'; DECLARE CONTINUEHANDLER forSQLSTATE'02000' SETDone=

Delete from table name ; TRUNCATE TABLE Table name ; not with where of the parameter Delete statement can be deleted MySQL all the contents of the table, using TRUNCATE TABLE can also be emptied MySQL all the contents of the table. Efficiency

This paper introduces the workflow and switch demonstration of the current mainstream high-availability software MHA (simulation from the library delay, the main library outage, data automatically completed)650) this.width=650; "src="

Copy principle 1. Master writes the data to Binlog. 2. Slave Open two thread I/O thread and SQL thread. 3. The slave I/O thread thread thread attached to master, reading the Binlog file name and Binlog position location on master. 4. Slave receives

1, installation Nodejs2. Install MySQL NPM packageAddress: Https://github.com/felixge/node-mysqlNPM install MySQL3, the corresponding API view and call:var mysql = require (' mysql '); var connection = mysql.createconnection ({ host '

[MySQL] MySQL deletes anonymous users to ensure login security Many MySQL programs use the anonymous logon function. After installing MySQL, you can log on to the database. This is basically nothing for MySQL, but this login method is definitely not

Two solutions for MySQL error Forcing close of thread 1. Modify the mysql configuration file If the configuration file is my. ini, you can add the following two content in my. ini: Skip-locking Skip-name-resolve Note: In the new mysql version,

Is MySQLMDL related to the storage engine?The background is that a service's logdb history oss_log (MyISAM Table type) is routinely deleted, and sometimes "deadlock" is reported ". Analysis of slow log found that some deletion takes a long time,

MySql Command Overview1. Mysql connection format: mysql-h host address-u user name-p User Password1. Connect to MYSQL on the local machine.First, open the DOS window, enter the mysql \ bin directory, type the mysql-u root-p command, and press enter

Principles of MySql index algorithms (easy to understand, only B-tree) When I first started learning, Baidu went to check it. However, I found that many of them were too complicated to understand. I would like to summarize them in the light of each

Mysql advanced triggers A trigger is a special type of transaction that can monitor certain data operations (insert/update/delete) and trigger related operations (insert/update/delete ). Check the following events:   Complete the ordering and

MySQL-(Master-Slave) configuration, mysql-master-slave 1. Two machines with the same version of MySQL installed 192.168.29.128 (master) MySQL-5.6.21 192.168.29.129 (slave) MySQL-5.6.21   2. Configure the master Configure binary log and server

Mysql has been transferred to mongoö'hangzhou' and has been released. ¸ Ä äî À à like óú° ¯ ý ', μ ± Ò Ö ö' Ð â  һ ¶ ú úâ µ µä± ± ° ò,. ~úâ ×° µäó ¾ äì À ï à æ, ********* if/else, case, while µè {ö~~á. É Ò Ô ø Ð SQL ± à ³ Ì. Ú úmysql öhei,

MySQL floating point representation MySQL floating-point and fixed-point types can be expressed by the type name plus (M, D). M indicates the total length of the value, and D indicates the length after the decimal point, M and D are also called