我似乎无法重新创建一个我已经删除的简单用户，即使是MySQL的根用户。
我的案例:用户'jack'之前存在，但我从mysql中删除了它。用户才能重新创建它。我在那张桌子上没看到这东西的痕迹。如果我对其他一些随机用户名执行这个命令，比如'jimmy'，它就能正常工作(就像它最初对'jack'所做的那样)。
我做了什么破坏用户'jack'，我如何撤销这个破坏，以重新创建'jack'作为MySQL安装的有效用户?
参见下面的示例。(当然，最初，jack这个词从被创造到被移除之间有很长一段时间。)
mysql> CREATE USER 'jack'@'localhost' IDENTIFIED BY 'test123';
Query OK, 0 rows affected (0.00 sec)
mysql> select user,host from user;
+------------------+-----------------+
| user | host |
+------------------+-----------------+
| root | 127.0.0.1 |
| debian-sys-maint | localhost |
| jack | localhost |
| root | localhost |
| root | russ-elite-book |
+------------------+-----------------+
5 rows in set (0.00 sec)
mysql> delete from user where user = 'jack';
Query OK, 1 row affected (0.00 sec)
mysql> select user,host from user;
+------------------+-----------------+
| user | host |
+------------------+-----------------+
| root | 127.0.0.1 |
| debian-sys-maint | localhost |
| root | localhost |
| root | russ-elite-book |
+------------------+-----------------+
4 rows in set (0.00 sec)
mysql> CREATE USER 'jack'@'localhost' IDENTIFIED BY 'test123';
ERROR 1396 (HY000): Operation CREATE USER failed for 'jack'@'localhost'
mysql> CREATE USER 'jimmy'@'localhost' IDENTIFIED BY 'test123';
Query OK, 0 rows affected (0.00 sec)
mysql> select user,host from user;
+------------------+-----------------+
| user | host |
+------------------+-----------------+
| root | 127.0.0.1 |
| debian-sys-maint | localhost |
| jimmy | localhost |
| root | localhost |
| root | russ-elite-book |
+------------------+-----------------+
5 rows in set (0.00 sec)
我今天遇到了这个问题，我通过以下步骤解决了它:
1)手动在mysql.user中插入麻烦的用户提供的必填字段值
mysql> insert into user(Host, User, Password, ssl_type)
values ('localhost', 'jack', 'jack', 'ANY');
2)
mysql> select * from user where User = 'jack';
1 row in set (0.00 sec)
3)。
mysql> drop user jack;
Query OK, 0 rows affected (0.00 sec)
B. mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
C. mysql> create user 'jack' identified by 'jack';
Query OK, 0 rows affected (0.00 sec)
D. mysql> select Host, User, Password, ssl_type from user where User = 'jack';
+-----------+-----------+-------------------------------------------+----------+
| Host | User | Password | ssl_type |
+-----------+-----------+-------------------------------------------+----------+
| localhost | jack | jack | ANY |
| % | jack | *45BB7035F11303D8F09B2877A00D2510DCE4D758 | |
+-----------+-----------+-------------------------------------------+----------+
2 rows in set (0.00 sec)
4)。
mysql> delete from user
where User = 'nyse_user' and
Host = 'localhost' and
Password ='nyse';
Query OK, 1 row affected (0.00 sec)
B.
mysql> select Host, User, Password, ssl_type from user where User = 'jack';
+------+-----------+-------------------------------------------+----------+
| Host | User | Password | ssl_type |
+------+-----------+-------------------------------------------+----------+
| % | jack | *45BB7035F11303D8F09B2877A00D2510DCE4D758 | |
+------+-----------+-------------------------------------------+----------+
1 row in set (0.00 sec)
希望这能有所帮助。
我和OP有同样的问题，接受的答案不适合我。在接受答案的评论中，@Rathish发布了一个对我有用的解决方案，我想引起大家的注意。
这是链接:
https://www.rathishkumar.in/2018/10/Error-1396-HY000-Operation-CREATE-DROP-USER-failed-for-user-host.html
Rathish的解决方案是撤销所有用户的访问权限:
REVOKE ALL ON *.* FROM 'user'@'host';
DROP USER 'user'@'host';
FLUSH PRIVILEGES;
他还很有帮助地指出，你可以通过选择“user”和“host”来查询下面的表格，以确定你是否有之前操作留下的残留用户:
mysql.user: User accounts, global privileges, and other non-privilege columns
mysql.db: Database-level privileges
mysql.tables_priv: Table-level privileges
mysql.columns_priv: Column-level privileges
mysql.procs_priv: Stored procedure and function privileges
mysql.proxies_priv: Proxy-user privilege
谢谢你！
