How to add MS SQL Database in your site in Plesk
To create new or manage existing databases, perform the following steps:
1 – Logged in to Plesk.
2 – Go to Databases.
3 – Click Add Database.
4 – Enter Database name.
5 – Select Related site for this databases.
6 – Create a default database user, Enter Database user name.
7 – Enter password and confirm.
8 – To allow user to access all databases, checkbox User has access to all databases within the selected subscription
9 – Click OK.