MySQL

I've been exposed to triggers before, but I haven't written them myself, so here's a simple example:The function is: two tables t_test,t_emp; Adding a trigger to T_test lets t_test add 1 to the NUM field value in T_emp each insertion of a single

1, extract to a directory (recommended root directory), such as: D:\mysql2. Add D:\mysql\bin in the system path3, this version without My-default.ini, need to write, put in D:\mysql\my.ini, relevant parameters can refer to

1. Create a replication user' Rep_user ' @'%.192.168.0.106'123456';2. Permission Grant' Rep_user ' @'%.192.168.0.106';3. Back up the main libraryC:\users\administrator>mysqldump-uroot--password--databases test01 >e:/temp/20170507/ ****Show master

Purpose: Host system/var directory is almost full, the query is the largest file is MySQL ibdata1 file, 17G size, it is necessary to migrate this file to other directories to release the/var directory space.1. It's a good habit to back up the

ERROR 1045 (28000): Access denied for user ' ODBC ' @ ' localhost ' (using Password:no)ERROR 1045 (28000): Access denied for user ' ODBC ' @ ' localhost ' (using Password:yes)The steps are as follows:In the MySQL installation directory, locate the

Steps:1. Turn on transaction start transactionWhen we start a transaction, our operations on SQL occur in memory, but there is no real feedback to the files in the database disk!2. Rollback rollbackRollback is the most primitive state to revert to

1.mysql: No useradd and Groupadd command, fortunately the original/etc/passwd have mysql,www users,/etc/group also have mysql,www user group2.nginx: Compile nginx, install OpenSSL can not use/usr/local/cellar/opensll/1.0.2 (through brew), need to

1. Combining WHERE clausesOperator (operator): a keyword used to join or change clauses in a WHERE clause.2, and operatorInput: SELECT prod_id,prod_price,prod_nameFrom ProductsWHERE vend_id = 1003 and Prod_price Analysis: Display three columns

1, first download MySQL 5.7.18 on MySQL website2 Installing MySQLInstall the dependency package first: Yum install libaio-yCreate MySQL users and groupsGroupadd MySQLUseradd mysql-g MySQLCreate MySQL installation directoryUnzip MySQL to the

Connection database var mysql = require (' mysql '); var connection = Mysql.createconnection ({ host: ' bdm253137448.my3w.com ',// Database address user : ' bdm253137448 ', //database user name password: ' muchengfeng123 ',//Database

Because of the paging mechanism of MySQL: instead of skipping offset lines, take offset + n rows, then return to discard the previous offset line, return n rows ,Therefore, when offset is particularly large, the efficiency is very low, either

EmpyoyeeManger_1.0, mindmanger16.0.159 Overall Structure First, create a database named "employee ". Create database employee; Create a table under the database. CREATE TABLE t_emp( id BIGINT PRIMARY KEY AUTO_INCREMENT, NAME VARCHAR(50)

MySQL v5.7.18 decompression installation tutorial, mysqlv5.7.18 Download MySQL Https://dev.mysql.com/downloads/mysql/5.1.html#downloads The PC is 64-bit, so download: Windows (x86, 64-bit), ZIP Archive Decompress and install 1. decompress the

Mysql 5.7.18 winx64 password modification, 5.7.18winx64 After mysql 5.7.18 is successfully installed, because mysql 5.7 does not support empty password login, we have to find a temporary password in a log file under the data Directory. The

How to view mysql tablespaces and indexes: mysql Indexes1. view the index (1) in GBSelect concat (ROUND (SUM (index_length)/(1024*1024*1024), 2), 'gb') AS 'total Index size' FROM information_schema.TABLES WHERE table_schema LIKE 'database ';+ -------

MySQL -- Percona-XtraDB-Cluster uses xtrabackup to add nodes, Although PXC supports online addition of cluster nodes, wsrep_sst_method = xtrabackup or wsrep_sst_method = mysqldump has not been resolved. Therefore, we try to manually back up and

Mysql and mysql 1. How to log on to mysql Run mysql-u 'your username'-p in linux and press Enter. Enter the password to log on to mysql.   2. Display mysql Databases Run the show databses command in the mysql command line.   3. How to Select

I skipped the password policy of Mysql 5.7 and Mysql. Mysql has no password policy since mysql 5.6, so we can set the password for every user as we like, what is 123, abc, or even a space, that is OK. The mysql. user table also contains the password

Mysql for DatabasesPreparation Ubantu system, navicat for mysql softwareIntroduction Mysql is designed based on the c/s communication architecture. Users interact with the server through the client, and the server operates on the database. Simply

MySql installation configuration on Mac and MySqlMac installation Configuration 1. Download and install Download Community version dmg installation files: https://dev.mysql.com/downloads/mysql/ 1. Execute the installation file and follow the steps