GATE IT 2004 | Question: 74

Question

A relational database contains two tables student and department in which student table has columns roll_no, name and dept_id and department table has columns dept_id and dept_name. The following insert statements were executed successfully to populate the empty tables:

Insert into department values (1, 'Mathematics')
Insert into department values (2, 'Physics')
Insert into student values (l, 'Navin', 1)
Insert into student values (2, 'Mukesh', 2)
Insert into student values (3, 'Gita', 1)

How many rows and columns will be retrieved by the following SQL statement?

Select * from student, department

• A. 0 row and 4 columns
• B. 3 rows and 4 columns
• C. 3 rows and 5 columns
• D. 6 rows and 5 columns

Comments

here in the sql query it is not given any join its default so we have done cartesian product which results in 6 rows and 5 columns

Answer 1

by using natural join 3 rows and 4 columns get