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6. Either change the users login (``UPDATE login SET login='NEWLOGIN' WHERE
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login='LOGIN'``) or remove all references to this login in the database
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The following lines of SQL should remove all traces of a user from the
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The following lines of SQL should remove all traces of a user ``LOGIN`` from
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DELETE FROM exercise_save USING login WHERE
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DELETE FROM login WHERE login='LOGIN';
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If you do not want to lose group data, a better option may be to reassign the
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user ``LOGIN``'s groups to ``NEWLOGIN`` (one possible option would be to
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create and use a 'nobody' account)::
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DELETE FROM exercise_save USING login WHERE
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exercise_save.loginid = login.loginid AND login.login = 'LOGIN';
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DELETE FROM exercise_attempt USING login WHERE
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exercise_attempt.loginid = login.loginid AND login.login = 'LOGIN';
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UPDATE project_mark SET marker = l2.loginid FROM login AS l1, login AS l2
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WHERE marker = l1.loginid AND l1.login = 'LOGIN' AND l2.login =
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DELETE FROM project_submission USING login WHERE
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submitter = login.loginid AND login.login = 'LOGIN';
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UPDATE project_extension SET approver = l2.loginid FROM
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login AS l1, login AS l2 WHERE approver = l1.loginid AND
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l1.login = 'LOGIN' AND l2.login='NEWLOGIN';
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DELETE FROM assessed USING login WHERE
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assessed.loginid = login.loginid AND login.login = 'LOGIN';
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DELETE FROM enrolment USING login WHERE
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enrolment.loginid = login.loginid AND login.login = 'LOGIN';
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DELETE FROM group_member USING login WHERE
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group_member.loginid = login.loginid AND login.login = 'LOGIN';
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DELETE FROM group_invitation USING login WHERE
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group_invitation.loginid = login.loginid AND login.login = 'LOGIN';
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UPDATE group_invitation SET inviter = l2.loginid FROM
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login AS l1, login AS l2 WHERE inviter = l1.loginid AND
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l1.login = 'LOGIN' AND l2.login='NEWLOGIN';
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UPDATE project_group SET createdby = l2.loginid FROM
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login AS l1, login AS l2 WHERE createdby = l1.loginid AND
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l1.login = 'LOGIN' AND l2.login = 'NEWLOGIN';
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DELETE FROM login WHERE login='LOGIN';