MySQL import database error [err] 1273 - unknown collation: 'utf8mb4_ 0900_ ai_ ci’

Recently, some people asked , Why is it involved in importing mysql The script will appear [Err] 1273 – Unknown collation: ‘utf8mb4_0900_ai_ci’, So today I will explain this problem in detail ,

Speaking of this question , We need to understand mysql Some of the principles . The general functional requirement is that we need to import our database script , And you need a successful import to run the project . Then why when importing , He will make mistakes .

With This question , Please read the following article carefully , Seriously understand .

Data exported by high version , such as mysql8, To mysql5.7 Error will be reported after recovery

[Err] 1273 - Unknown collation: 'utf8mb4_0900_ai_ci'

I know it's about character set encoding , But I changed the code of the database to utf8mb4 It also reports an error after importing , When importing the file, there is no utf8mb4 Options

baidu Then we found the solution .

Solution ：

Put all in the file

utf8mb4_0900_ai_ci Switch to utf8_general_ci

utf8mb4 Switch to utf8

Run again after saving to succeed .