SQL SERVER – FIX : Error 15023: User already exists in current database. Error 15023: User already exists in current database. 1) This is the best Solution.First of all run following T-SQL Query in Query Analyzer. This will return all the existing users in database in result pan.USE YourDBGOEXEC sp_change_users_login 'Report'GORun following T-SQL Query in Query Analyzer to associate login with the username. ‘Auto_Fix’ attribute will create the user in SQL Server instance if it does  
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