MySQL

Create a table#品牌表CREATE TABLE Pinpai (IDS int Auto_increment primary KEY, #主键自增长列Name varchar (#品牌名称));#商品表CREATE TABLE Shangpin (Code int primary KEY, #商品代号Name varchar (not NULL), #商品名称Price float, #商品价格Pinpai int, #所属品牌Foreign KEY (Pinpai)

SELECT *,count (*) as num from ' Wms_stock ' GROUP by SKU_ID,BATCH_SN have count (*) >1After-sale refund an order with two export batches for the same item, multiple packages, refunds with multiple records resulting in duplicate dataSELECT

Stored procedures: In fact, is stored in the database, there are some logical statements and SQL statements composed of functions. Because it is a compiled statement, execution is fast and secure.Open the MySQL console and start writing the stored

Multiple substitution of strings: (replaced four times)SELECTReplace (replace (replace (T5,SubstringT5,LOCATE (' ×tamp ', T5),24),‘‘), SUBSTRING (T5,LOCATE (' &accesssignature ', T5),47), "), SUBSTRING (T5,LOCATE (' &time_stamp ', T5),25), "),

1. Connect to the databaseMysql-u root-pmysql-h ip-u user_name-p entering the command requires a database connection after entering the password2. Exit the databaseExit3. Change the passwordMysqladmin-u username-p old_password Password New_password4.

I. Preparatory workThis experiment was performed on two ubuntu14, using mysql5.6, the precondition of the master-slave backup must be the same MySQL version, and have the same initial dataPrimary server ip:192.168.0.221From server

MyCAT details, 1. MyCAT OverviewMyCAT is a distributed middleware evolved from Alibaba Cobar to support database read/write splitting and sharding. MyCAT not only supports Oracle, MSSQL, MYSQL, PG, DB2 relational databases, but also supports

How to clear mysql logs? First, we can use the following command to clear MYSQL logs: Rm-f/usr/local/mysql/var/mysql-bin .* Restart your VPS. If LNMP is used: /Root/lnmp restart In this way, the unwanted junk log files are deleted. If you need

Win10 installation of MySQL5.7.18winX64 failed to start the server and no error prompt 1: Modify the environment variable path, added value D: \ Program Files \ MySQL Server 5.7 \ bin 2: I copied my. ini (It's my-default.in, my. ini is renamed

Diagram of the installation process from uninstallation to MySQL5.7.18 yum in Linux Uninstall How to unmount MySQL5.7.18 yum in Linux Rpm-qa | grep-I mysql Run the rpm-qa | grep-I mysql command to view installed components. Run the yum-y remove

How to remotely connect to a MySQL database in Linux Procedure 1. How to enable remote access to the MySQL database on the server First, enter the mysql database, and then enter the following two commands: Grant all privileges on *. * to 'root'

Example of how to add and delete a MySQL 5.5 range Partition I. delete partitions # View the data volume of the partition to be processed and export the example MySQL> select count (*) from baby_account_change_log where updated_time> '2017-12-01 00:

CentOS7 install mysql 5.7.18 using the rpm package 1. # yum install libaio // MySQL dependency package 2, # rpm-ivh mysql-community-libs-5.7.17-1.el6.x86_64.rpm mysql-community-client-5.7.17-1.el6.x86_64.rpm mysql-community-common-5.7.17-1.el6.x86_6

How to replace null IFNULL () and COALESCE () functions in mysql In MySQL, The isnull () function cannot be used as an alternative null value! For more information about functions such as IFNULL () and COALESCE () in mysql First, there is a table

Mysql executes SQL file commands * ********** Execute an SQL file in the mysql command line *********** C: \ Windows \ system32> cd E: \ MySQL \ mysql-5.7.16-winx64 \ bin // switch the directory to the directory where the binfile of mysql is

Detailed description of Character Set Configuration of MySql5.7.18 Create a new my. ini file and place it under D: \ mysql, Which is exactly one of the positions it shows, such. The content of my. ini is as follows: Basically, it is configured in

Mysql command line Logon 1. Storage path of MySQL built-in tools: D: \ Program Files \ MySQL Server 5.6 \ bin // flexible response For ease of use, we can add the above path to the system's environment variable path. If you do not release the

Mysql cmd command Overview Put mysql.exe in the binary directory under mysqldirectory under C: \ WINDOWS. You can run the following command: Connection: mysql-h host address-u user name-p User Password (Note: u and root do not need to add spaces,

How does mysql export SQL files? Method 1 Run mysqldump -- opt-h192.168.0.156-uusername-ppassword -- skip-lock-tables databasename> database. SQL to change the ip address to localhost In the mysql bin directory. If navicate is installed, it is

Mysql Database Import Statement 1. Export the entire database Mysqldump-u username-p Database Name> exported file name Mysqldump-u wcnc-p smgp_rj_wcnc> wcnc. SQL 2. Export a table Mysqldump-u user name-p database name Table Name> exported file name