Build a World Cup Database

OK so I started this project yesterday and all of the tasks except for the last 3 were showing as complete when I logged off. I log back in today and now NONE of the tasks are showing as complete. Even though I can confirm that all my work is still in tact. The database and tables and columns are all still there just as I had left them yesterday.

What gives? Does this mean I have to delete everything and start over?

EDIT:
I figured it would be quicker for me to just start over than wait for a response. But I’m getting the following error message when trying to DROP DATABASE:

ERROR: database “worldcup” is being accessed by other users
DETAIL: There is 1 other session using the database.

How this is even possible? I’ve tried opening multiple projects simultaneously so I can refer back to prior lessons while working on this project, but this system doesnt even allow more than one open project at a time. It just logs me out of whatever project I’m logged into when I go to open an additional project.

UPDATE:
So I decided to try again this morning and was able to successfully delete the worldcup database. I’ve re-created the database and the 2 tables but the system is not registering as those tasks having been completed.

Anyone know whats going on?

have you tried connecting to the database and clicking run manually