MySQL

==null and is null are always mistaken, now summarize the mistakes you have encountered in your work.1, at the time of inquirySelect * from user where name is null; select  * from user  where name is not null 2, when updated

Open General_log log, get mysqldump EXECUTE statementShow VARIABLES like ' general_log% ' set GLOBAL general_log=onExecute backup commandMysqldump--single-transaction-uroot-pdmysqlbadmin--master-data=2-a -r-e >/data/test.sqlGet General_log Log161109

1. First, we need two virtual machines (centos7,linux text).2. Configure the network environment for two virtual machines to bridge mode CentOS7 IP to 192.168.100.137, 24,linux text IP to 192.168.100.237/24, and then configure the Yum Source

Directly on the code"Official documentation See HTTP://WWW.HIGHCHARTS.COM/DOCS/WORKING-WITH-DATA/GETTING-DATA-ACROSS-DOMAINS-JSONP""Instance http://highcharts-mzm.rhcloud.com/"1, index.htmlDOCTYPE HTML>HTML> Head> Metahttp-equiv=

　　　　　　　　　　　　　　　　　　　　　　　　　　　Zabbix using its own template to monitor MySQL databaseYun Zhengjie Some things you don't think it's particularly difficult when you do it, but when you do it you find it so simple ~zabbix powerful I'm not here tell me

SyntaxUpdate table name set column name = column value, column name = column Value ... [Conditions];"Precautions"* The value of the modified column needs to be consistent with the column type.* The length of the value of the modified column cannot

I. Creating a user1. Login to enterRoot The user's password is initially empty, after the initial installation of MySQL, after configuring the environment variable. In the Command window, enter:Mysql–u root–pEnter the input directly when prompted

1. Display Databaseshow databases;2. Select DatabaseUse database name;3. Display the tables in the databaseShow tables;4, display the structure of the data tabledescribe table name;5. Display the records in the tableSELECT * FROM table name6. Build

After using the VPS for a period of time, you find that the disk space is almost full. My VPS bought a 500GB disk at the time of purchase, and the provider presented a 20GB high-performance system disk. So the system has two disk space. The database

To back up the database:Server 1:192.168.26.210Mysqldump-uroot-p-h127.0.0.1--all-databases--flush-logs--master-data=2--lock-all-tables >all.sql650) this.width=650; "Src="

MySQL Master: 192.168.26.210 (CENTOS6.6,MARIADB10)MySQL from: 192.168.26.211 (CENTOS6.6,MARIADB10)Read/write Splitter mysql-proxy:192.168.26.212Master: MySQL configuration file editing:Vim/etc/my.cnf.d/server.cnf650) this.width=650; "Src=" Http://s4.

Do project, error"Incorrect string value: ' \\xF0\\x9F\\x98\\x8B ' for column ' nickname ' at row 1"The reason is that the nickname contains emoticons, the expression is 4-byte encoding, and the MySQL utf-8 encoding only supports 1-3 bytes. Starting

1. The test process is as follows:CREATE TABLE' Test ' (' ID ')int( One) not NULLauto_increment, ' name 'varchar( -)DEFAULT NULL, PRIMARY KEY(' id '),UNIQUE KEY' name ' (' name ')) ENGINE=InnoDBDEFAULTCHARSET=utf8Transaction 1: 　　　　　　　　　　　　　　　　　　　　　

In general, we store pictures in the file system, but only in the database to store the file path, but sometimes there are special needs: the picture binary into the database.Today we're using the Python+mysql way.MYSQL is to support the image into

mysql5.7 new features multi-source replication is practical, easy to summarize the sub-library environment, centralized backup and data statistical analysis.My lab Environment 3 machines, MySQL version: 5.7.1610.10.203.102 from Library10.10.203.93

Parallel replication, mainly to solve the sql_thread in high concurrency environment, there are performance bottlenecks. The idea of mysql5.7 parallel replication is straightforward, and a group commits a transaction that can be replayed in parallel

184. Department Highest SalaryThe Employee table holds all employees. Every employee has an ID, a salary, and there are also a column for the department ID.+----+-------+--------+--------------+|Id|Name|Salary|DepartmentID|+----+-------+--------+----

How to use the official MySQL image of DockerHub, dockerhubmysql Preface Recently, I have been trying to create a centos-based MySQL Image Based on the official centos image. However, after the image is created, the image size exceeds 1.5 GB, which

Easy understanding of last_insert_id () and mysqllastinsertid in MySQL Functions Preface A recent colleague asked me whylast_insert_id()The result is different from the expected one. So I will study this parameter carefully. The following is

Mysql5.7 installation tutorial (windows), mysql5.7 tutorial How to install and configure mysql5.7 Download Mysql 5.7.msi Install Double-click mysql. msi and follow the prompts to install it. Precautions after installation) Set the mysql environment