ERROR 1396 (HY000): Operation CREATE USER failed - mysql

Question

i was creating a db in mysql and ran commands-
create database projectdb;
create user 'aquaman'#'localhost' identified by password'aquaman123';
and it gave error-
ERROR 1396 (HY000): Operation CREATE USER failed for 'aquaman'#'localhost'
anyone please help me how to resolve it

Answer 1

I ran into this issue having previously deleted a user of the same name directly from the user table:
DELETE FROM mysql.user WHERE User='aquaman';
But this isn't the right way to delete a user! Having dropped the user properly, via:
DROP USER 'aquaman';
...I was once again able to successfully create a user with this name.

Answer 2

Incorrect Syntax!!
You have included an extra password in your code.
Change the code from:
create user 'aquaman'#'localhost' identified by password'aquaman123';
TO:
CREATE USER 'aquaman'#'localhost' IDENTIFIED BY 'aquaman123';
Please check the documentation: http://dev.mysql.com/doc/refman/5.0/en/create-user.html

Answer 3

I faced the same issue in the below MySQL version in MAC OS - Catalina:
Your MySQL connection id is 8
Server version: 8.0.27 MySQL Community Server - GPL
I was able to solve the issue by the below commands:
mysql> create database testdb;
Query OK, 1 row affected (0.04 sec)
mysql> create user 'test'#'%' identified by 'YourPassword$';
Query OK, 0 rows affected (0.07 sec)
or
mysql> create user 'test'#localhost identified by 'YourPassword$';
Query OK, 0 rows affected (0.07 sec)
mysql> grant all on testdb.* to 'test'#'%';
Query OK, 0 rows affected (0.00 sec)
or
mysql> grant all on testdb.* to 'test'#localhost;
Query OK, 0 rows affected (0.00 sec)
mysql> select user from mysql.user;
+------------------+
| user |
+------------------+
| mysql.infoschema |
| mysql.session |
| mysql.sys |
| root |
| test |
+------------------+