Introduction to SQL
NULL is

the same as 0 for integer
not a value
the same as 0 for integer and blank for character
the same as blank for character

ANSWER DOWNLOAD EXAMIANS APP

Introduction to SQL
Which of the following query finds the total rating of the sailors who have reserved boat "103"?

SELECT s.rating FROM sailors s, reserves r WHERE s.sid = r.sid AND r.bid = 103
SELECT SUM(s.rating) FROM sailors s, reserves r AND r.bid = 103;
c) SELECT COUNT(s.rating) FROM sailors s, reserves r WHERE s.sid = r.sid AND r.bid = 103
SELECT SUM(s.rating) FROM sailors s, reserves r WHERE s.sid = r.sid AND r.bid = 103

ANSWER DOWNLOAD EXAMIANS APP

Introduction to SQL
What is a view?

A view is a virtual table which results of executing a pre-compiled query. A view is not part of the physical database schema, while the regular tables are.
A view is a database diagram.
A view is a special stored procedure executed when certain event occurs.
None of these

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Introduction to SQL