Msg 1801, Level 16, State 3, Line 1
Database ‘%1!’ already exists.
This error message appears when you try to create a database with a name under which already a database exists on the specific SQL Server instance.
The T-SQL statement can be parsed, but causes the error at runtime.
Error of the Severity level 16 are generated by the user and can be fixed by the SQL Server user. The database must be created with a different name.
All versions of SQL Server.
CREATE DATABASE Northwind
Databases on the same SQL Server instance must be uniquely identifiable. It is not possible to create more than 1 database with the same name.