INSERT INTO Members (MemberID, LastName, FirstName, UnivID, MajorID) VALUES ('7', 'Tabriz', 'Sonia', '1', IST)

You just entered a record with fixed values.

The Employees table has a primary key and this script entered a record with fixed values, therefore this script will only run OK once. Try to run it again and you will see that it won't work. However, you can delete the record and then the insert will work again (the link to delete single record with fixed value will delete this record).

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