How MySQL uses the distinct () command
This article will explain in detail how MySQL uses the distinct () command. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.
Distinct ()
Command: distinct
Function: weight removal
Application scenario: when statistical type, status, and discrimination are needed.
Example:
Mysql > select count (distinct (name)) / count (*) from t_base_user +-- + | count (distinct (name)) / count (*) | +-+ | 0.6667 | +-+ 1 row in This is the end of the article set (0.00 sec) on "how MySQL uses the distinct () command". Hope that the above content can be helpful to you, so that you can learn more knowledge, if you think the article is good, please share it for more people to see.
