Check out example codes for "1396(hy00) mysql error". It will help you in understanding the concepts better.

Code Example 1

mysql.server stop
mysql.server start

Code Example 2

drop user someuser;
flush privileges;

Code Example 3

grant all privileges on *.* to 'someuser'@'localhost' with grant option;

Code Example 4

create user 'someuser'@'localhost' identified by 'somepassword';
ERROR 1396 (HY000): Operation CREATE USER failed for 'someuser'@'localhost'

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