A super key is a set of one or more attributes that

none of the above
13.
4NF is designed to cope with:
14.
Every Boyee-Codd normal form is in

15.
Which command is used to remove all rows from a
table?
16.
Which of the following is an aggregate function in
SQL?
a.
Union
b.
Like
c.
Group By
d.
Max
17.
Which command is used to add a column to an
existing table?
18.
A deadlock exists in the system if and only if the
wait for graph:
19.
Rollback of transactions is normally used to:
20.
Prevention of access to the database by
unauthorized users is referred to as:
a.
Integrity b. Productivity
b.
Security d . Reliability
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