Shulou(Shulou.com)06/01 Report--

This article mainly explains "how to achieve overlapping grouping in the MySQL library". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to achieve overlapping grouping in the MySQL library".

When enumerating multiple conditions for grouping, overlap may occur, whether the overlap is counted only in a group or in all eligible groups, which is written very differently when writing SQL.

When only the first eligible group is counted, it can be converted to a regular grouping through case when, for example:

Select (case

When age=16 and age=28 and age

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.