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Install MySQL 5.6 when MySQL 8.0 is installed in win10 (install two mysql, and install the lower version in the higher version) Shut down the installed mysql service Download and unzip mysql5.6 Configure environment variables Modify my.ini configuration file Install mysql service Change Password R ...

Content review of MySql database learning (1) -Database creation: Name of create database character set character set collate collation --Database deletion: drop database database name -- Amendment: alter database character set character set (utf8) - enquiry: show database ...

MySql database learning (1) mySQL (relational database management system) MySQL is a relational database management system, developed by MySQL AB company in Sweden, which is currently a product of Oracle. MySQL is one of the most popular relational database management systems. In WEB application, MySQ ...

Preface This is a very simple attempt. The original intention is to replace PHP with nodejs and build a complete web project. Project logic vue develops the front-end, and is still in the dev mode. It uses proxy proxy proxy to communicate with the node back-end.node+express builds back-end web services, connects to mysql, and performs addition, ...

//This is a simple case - using MySQL database to store images in binary form The type of our database should be: mediumblob type Reason: in order to prevent the saved image from exceeding the storage capacity limit, the maximum storage capacity of mediablob is 16M. In MySQL, blob is a binary large obje ...

1. Download mysql binary installation package and dependency package wget http://mirror.centos.org/centos/7/os/x86_64/Packages/libaio-devel-0.3.109-13.el7.x86_64.rpm wget http://mirror.centos.org/centos/7/os/x86_64/Packages/libaio-0.3.109-13.el7.x86_64.rpm wget https://mirrors.tuna.tsinghua.edu.cn/mysql/downloads/MySQL-5.7/mysql-5.7.25-linux-g ...

Common SQL error usage 1. LIMIT statement Paging query is one of the most commonly used scenarios, but it is also the most prone to problems. For example, for the following simple statements, the general way DBA s think of is to add a composite index to the fields of type, name, create "time. In this way, conditional sorting can effe ...

Preface There are many open source implementations of Etcd's Java client. Jetcd is the Java client of Etcd's official warehouse. The overall api interface design and implementation are similar to the official go client, simple and easy to use. Among them, the lease renewal interface provides two interfaces: keepAliveOnce and keepAlive. As its n ...

text MySQL started to support json natively in 5.7.8. This article will give a brief description of the usage of json types in mysql, hoping to be useful to you. CREATE TABLE testproject ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `skill` JSON NOT NULL, `student` JSON NOT NULL, PRIMARY KEY (`id`) ); View table structure: ...

When the user asks you if the index will be used for in in MySQL query criteria, how do you answer? Answer: index may be used Let's test it. 1. Create a table to index the field port CREATE TABLE `pre_request_logs_20180524` ( `id` int(11) NOT NULL AUTO_INCREMENT, `ip` char(16) NOT NULL COMMENT 'agent IP', `port` int(8) NOT NULL COMMENT 'P ...