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This error message is received when I restore the database backup taken from SQL Server 2 to SQL server1. Since their sql server id's are different I am facing this issue. 
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This error message is received when I restore the database backup taken from SQL Server 2 to SQL server1. Since their sql server id's are different I am facing this issue. 

Error 15023: User already exists in current database.

Databases are organized collections of data, most commonly accessed through management systems including schemas, tables, queries and processes that allow users to enter and manipulate the information or utilize it in other fashions, such as with web applications or for reporting purposes.