Deleting a user from the aaauser table

Deleting a user from the aaauser table

Dear All,
 
i was trying to import a new user from active directory, it gives me any error that the user is already existing.
 
when i wrote this query (select * from aaauser) in the database query page, it give me that the user is existing in the table but i can't see him in the users page in the software.
 
 
can u tell me how to delete a user from the table.???

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