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MySQL insert when the record does not exist and update when the record exists

When the MySQL record does not exist, insert. When the record exists, there are basically three solutions to update the internet. First: Example 1: insert multiple records. Suppose There Is A client_id table with the primary key, you can use the

Mysql optimization Summary (insert and query)

Speaking of mysql, we immediately think of its small size, fast speed, and open source features, so it is widely used. Today, we will summarize the two most frequent mysql operations: insert and query, and the optimization methods. Insert: I. Text

MySQL Operations management-mysql Backup and recovery practical case and production plan 17

1. Full backup and incremental backup 1.1 full-scale backupFull-volume data is all the data in the database, and a full backup is the backup of all the data in the database.Back Up all libraries:mysqldump -uroot -p123456 -S /data/3306/mysql.sock -F -

MySQL insert when the record does not exist, update when the record exists, mysqlinsert

MySQL insert when the record does not exist, update when the record exists, mysqlinsert   There are basically three solutions on the Internet. First: Example 1: insert multiple records Suppose there is a clients table with the primary key of

MySQL Common instructions, java,php programmers, database engineers must. Programmers Xiaoice Common Data collation

MySQL常用指令,java,php程序员,数据库工程师必备。程序员小冰常用资料整理MySQL common commands (for reference)The most common display commands are:1. Display the list of databases;2. Display the data table in the library:Use MySQL;Show tables;3, display the

MySQL Course Design: MySQL cluster research and implementation

Henan College of Traditional Chinese Medicine Course Design Report of MySQL Database Management  Title: Research and Implementation of MySQL Clusters       Completion date:2012January 1, December 31   Contents 1. Course Design overview 3 2. research

Mysql database locking mechanism detailed introduction _mysql

Objective In order to ensure consistent integrity of data, there is a locking mechanism in any database. The quality of locking mechanism should be directly thought of the concurrent processing ability and performance of a database system, so the

MySQL query performance optimization

Abstract: This article describes how to optimize SQL queries. You can manually use the EXPLAIN statement to check the efficiency of SQL queries. In addition, some principles for optimizing SQL statements are described, mainly about how to optimize

Mysql DBA Advanced Operations Learning Note-mysql log files in the database

1.MySQL Engine Overview 1.1 What is a storage engineWhen we record a video file, it can be converted to different formats such as mp4,avi,wmv, and on the computer's disk will also exist in different types of file system Windows common Ntfs,fat32,

Get through the MySQL architecture and business of the two-pulse

Currently, MySQL databases are widely used in many OLTP scenarios, and there are many different ways to use them. From the database business requirements, architecture design, operational maintenance, and then to the expansion of the migration,

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