case statement in mysql 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

MySQL Format statement specificationHow do I log into your database?Example!If you are compiling the installation of the flowers, then you have to compile the installation of the directory to go, my is installed into the/usr/local/mysql database: Cd/

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

Two ideas for improving Orderby statement query efficiency in mysql Analysis of two ways to improve the query efficiency of Order by statements in mysql _ MySQL Because the database records may need to be reordered. In this article, I will talk

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 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 database operation statement and mysql statement Mysql format statement SpecificationHow to log on to your database?Example!If it is the cost of compilation and installation, you have to go to the directory after compilation and installation.

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