mysql> drop user yunqu; ERROR 1396 (HY000): Operation DROP USER failed for 'yunqu'@'%

这个错误可能是由于以下原因之一导致的：

1. 用户 "yunqu" 不存在。因此，DROP USER 命令无法删除该用户。

2. 你没有 DROP USER 权限。只有具有特权的用户才能执行DROP USER命令。

3. "yunqu" 用户是一个特殊的内置用户，不能被删除。

请检查用户是否存在，你是否具有 DROP USER 权限，以及该用户是否是内置用户。

相关问题

mysql> GRANT ALL PRIVILEGES ON *.* TO yunqu@'%' WITH GRANT OPTION IDENTIFIED BY 'p@sswr0d123'; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IDENTIFIED BY 'p@sswr0d123'' at line 1

这个错误的原因是语法错误，正确的语法应该是在GRANT ALL PRIVILEGES ON *.* TO yunqu@'%'后面加上一个关键字IDENTIFIED BY 'p@sswr0d123'，而不是在后面另起一行。正确的语法应该是：

GRANT ALL PRIVILEGES ON *.* TO yunqu@'%' IDENTIFIED BY 'p@sswr0d123' WITH GRANT OPTION;

这样就可以成功授权了。

mysql> GRANT ALL PRIVILEGES ON *.* TO yunqu@'%' IDENTIFIED BY 'p@sswr0d123' WITH GRANT OPTION; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IDENTIFIED BY 'p@sswr0d123' WITH GRANT OPTION' at line 1

这个错误的原因是语法错误，正确的语法应该是在GRANT ALL PRIVILEGES ON *.* TO yunqu@'%'后面加上一个关键字WITH GRANT OPTION，而不是在后面另起一行。正确的语法应该是：

GRANT ALL PRIVILEGES ON *.* TO yunqu@'%' IDENTIFIED BY 'p@sswr0d123' WITH GRANT OPTION;

这样就可以成功授权了。