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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)
Q. 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
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A relational database contains two tables student and department in wh...
Simple,Cartesian product of two tables will result Rows = 3*2=6 Columns= 3+2=5 So Answer is D  
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A relational database contains two tables student and department in wh...
This question is asking for the number of rows and columns that will be retrieved by a specific SQL statement. Let's break down the SQL statement and analyze it step by step.

The SQL statement is:

Select * from student, department

This statement is selecting all columns from two tables: student and department. The " * " symbol represents all columns.

To determine the number of rows and columns retrieved by this statement, we need to consider the number of rows and columns in each table.

The student table has three columns: roll_no, name, and dept_id. And there are three rows in the student table:

1, Navin, 1
2, Mukesh, 2
3, Gita, 1

The department table has two columns: dept_id and dept_name. And there are two rows in the department table:

1, Mathematics
2, Physics

Now, let's combine the two tables using a Cartesian product (also known as a cross join) since there is no join condition specified in the SQL statement. A Cartesian product combines every row from one table with every row from another table.

The Cartesian product of the student and department tables will result in six rows:

1, Navin, 1, 1, Mathematics
1, Navin, 1, 2, Physics
2, Mukesh, 2, 1, Mathematics
2, Mukesh, 2, 2, Physics
3, Gita, 1, 1, Mathematics
3, Gita, 1, 2, Physics

So, the SQL statement will retrieve six rows.

The combined result will have five columns: roll_no, name, dept_id, dept_id, and dept_name.

Therefore, the SQL statement will retrieve six rows and five columns.

The correct answer is option D: 6 rows and 5 columns.
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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)Q.How many rows and columns will be retrieved by the following SQL statement?Select * from student, departmenta)0 row and 4 columnsb)3 rows and 4 columnsc)3 rows and 5 columnsd)6 rows and 5 columnsCorrect answer is option 'D'. Can you explain this answer?
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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)Q.How many rows and columns will be retrieved by the following SQL statement?Select * from student, departmenta)0 row and 4 columnsb)3 rows and 4 columnsc)3 rows and 5 columnsd)6 rows and 5 columnsCorrect answer is option 'D'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about 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)Q.How many rows and columns will be retrieved by the following SQL statement?Select * from student, departmenta)0 row and 4 columnsb)3 rows and 4 columnsc)3 rows and 5 columnsd)6 rows and 5 columnsCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 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)Q.How many rows and columns will be retrieved by the following SQL statement?Select * from student, departmenta)0 row and 4 columnsb)3 rows and 4 columnsc)3 rows and 5 columnsd)6 rows and 5 columnsCorrect answer is option 'D'. Can you explain this answer?.
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