Send the last error to the Technical Group and then respond immediately. Some of them asked me to create a database on the graphic interface (not succeeded), and some asked me to view the previous trigger. Here, I would like to thank the "another year's bloom" netizens who helped me find the crux of the problem through remote assistance.
Previously, a trigger that does not allow database creation was created when the trigger was created.
This trigger is under the 'trigger 'node of 'server object. After deleting this trigger, you can successfully create a database.
Set ansi_nulls on
Go
Set quoted_identifier on
Go
Create trigger [trig_nocreatedatabase]
On all server
For create_database
As
Begin
Print 'database cannot be created'
Rollback transaction
End
Go
Set ansi_nulls off
Go
Set quoted_identifier off
Go
Enable trigger [trig_nocreatedatabase] on all server
Go