在升級MySQL版本到8.0的過程中，需要關注sql_mode引數預設值的變化，8.0版本sql_mode不支援 NO_AUTO_CREATE_USER，要避免配置的sql_mode中帶有 NO_AUTO_CREATE_USER

■ 57版本原來配置
show variables like '%sql_mode%';
STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

■ 修改配置檔案
註釋掉sql_mode，並重啟，檢視57版本的預設設定
ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
■ 修改全域性變數

■ 以下測試

create database test;
grant CREATE, DROP, INSERT, SELECT, DELETE, UPDATE, ALTER on test.* to inspur@'%' identified by 'password';
set password for inspur@'%' = password('password');
drop user inspur@'%';
drop database test;
flush privileges;

set sql_mode ='NO_AUTO_CREATE_USER';
grant CREATE, DROP, INSERT, SELECT, DELETE, UPDATE, ALTER on test.* to inspur@'%' identified by 'password';
set global sql_mode ='';
grant CREATE, DROP, INSERT, SELECT, DELETE, UPDATE, ALTER on test.* to inspur@'%' identified by 'password';
 

均可以執行，在80版本估計就有問題了。