RENAME USER old_user TO new_user [, old_user TO new_user] ...
RENAME USER statement renames
existing MySQL accounts. An error occurs for old accounts that
do not exist or new accounts that already exist.
RENAME USER, you must have
CREATE USER privilege,
UPDATE privilege for the
mysql system schema. When the
read_only system variable is
RENAME USER additionally
privilege (or the deprecated
RENAME USER fails with an error
if any account to be renamed is named as the
DEFINER attribute for any stored object.
(That is, the statement fails if renaming an account would cause
a stored object to become orphaned.) To perform the operation
anyway, you must have the
SET_USER_ID privilege; in this
case, the statement succeeds with a warning rather than failing
with an error. For additional information, including how to
identify which objects name a given account as the
DEFINER attribute, see
Orphan Stored Objects.
Each account name uses the format described in Section 6.2.4, “Specifying Account Names”. For example:
RENAME USER 'jeffrey'@'localhost' TO 'jeff'@'127.0.0.1';
The host name part of the account name, if omitted, defaults to
RENAME USER causes the privileges
held by the old user to be those held by the new user. However,
RENAME USER does not
automatically drop or invalidate databases or objects within
them that the old user created. This includes stored programs or
views for which the
DEFINER attribute names
the old user. Attempts to access such objects may produce an
error if they execute in definer security context. (For
information about security context, see
Section 25.6, “Stored Object Access Control”.)
The privilege changes take effect as indicated in Section 6.2.13, “When Privilege Changes Take Effect”.