Unknown collation: ‘utf8mb4_ 0900_ ai_ Solution of CI '

analysis

The reason for this problem is sql File is mysql（8.0 edition ）, High to low （5.6 edition ） Version incompatibility during import .

solve

1. Put all the... In the file utf8mb4_0900_ai_ci Replace with utf8_general_ci
2. as well as utf8mb4 Replace with utf8

original text ：Unknown collation: ‘utf8mb4_0900_ai_ci‘ Solutions for _ Huang Jiajun 、 The blog of -CSDN Blog _utf8_0900_ai_ci