case in mysql select query

One: Connection query:Connection query is to connect two or more tables according to a certain condition, select the required data, the connection query query two or more tables at the same time, when there are fields representing the same meaning

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 Query performance optimizationThe optimization of MySQL query performance involves many aspects, including library table structure, establishing reasonable index and reasonable query. The library table structure includes how to design

High Performance MySQL Reading Notes-query performance optimization, high performance mysql For high-performance database operations, it is not enough to design the optimal database table structure and build the best index. You also need to design

MySQL database in the query, sometimes the English letter case sensitive, sometimes not, mainly by the MySQL character validation rules of the setting of the decision, usually by default is not supported uppercase and lowercase sensitive. 1. What

MySQL Query case sensitivity problem analysishttp://blog.rds.aliyun.com/2014/05/06/rds%e4%b8%ad%e7%9a%84mysql%e5%a4%87%e4%bb%bd%e6%81%a2%e5%a4%8d/MySQL Query case sensitivity problem analysisApril 30, 2014 dba released reply MySQL

For high-performance database operation, it is not enough to design the optimal library table structure, and to establish the best index, but also need reasonable design query. If the query is poorly written, high performance cannot be achieved even

MySQL Slow Query Log (Slow Query Log), mysqlslow Like most relational databases, log files are an important part of MySQL databases. MySQL has several different log files, such as error log files, binary logs, common logs, and slow query logs. These

1. download MySql 1. download MySql Open http://www.mysql.com/downloads/mysql/#downloads download in browser My downloaded version is Red Hat 5 version of http://www.mysql.com/downloads/mirror.php? Id = 407552 Upload the file to the server, or

This article introduces four database query methods by combining text and text: Basic query, connection query, subquery, and regular expression query, for more information, see query data to obtain the required data from the database. Data query is