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This article mainly shows you "MySQL how to use aggregate function", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "MySQL how to use aggregate function" this article.

Aggregate function

Commands: sum (), count (), avg (), max (), min ()

Function: statistics, average, maximum and minimum

Application scenario: this kind of function is very common and is mainly used for data statistics. It is also applicable to SQL optimization.

Example:

Mysql > select max (id) from tasking baseband username + | max (id) | +-+ | 2 | +-+ 1 row in set (0.00 sec)

Here's a tip: if the primary key is incremented in order, you can use max (id) instead of the count (*) function when it comes to how many users are needed.

These are all the contents of the article "how MySQL uses aggregate functions". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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