SQL Online Quiz

Q 1 - Consider the following schema −

STUDENTS(student_code, first_name, last_name, email, 
         phone_no, date_of_birth, honours_subject, percentage_of_marks);

Which of the following query would display all the students where the second letter in the first name is ‘i’?

A - select first_name from students where first_name like ‘_i%’;

B - select first_name from students where first_name like ‘%i_’;

C - select first_name from students where first_name like ‘%i%’;

D - select first_name from students where first_name like ‘_i_’;

Q 2 - Consider the following schema −

STUDENTS(student_code, first_name, last_name, email, 
         phone_no, date_of_birth, honours_subject, percentage_of_marks);

Which of the following query would correctly display the students’ first name, last name, honours subject and date of birth, born between July 1^st 1996, and 30^th June 1999.

A - select first_name, last name, honours_subject, date_of_birth from students where date_of_birth between ’30-JUN-1999’ and ’01-JUL-1996’;

B - select first_name, last name, honours_subject, date_of_birth from students where date_of_birth in (’30-JUN-1999’ , ’01-JUL-1996’);

C - select first_name, last name, honours_subject, date_of_birth from students where date_of_birth like ’30-JUN-1999’ and ’01-JUL-1996’;

D - select first_name, last name, honours_subject, date_of_birth from students where date_of_birth between ’01-JUL-1996’ and ’30-JUN-1999’;

Q 3 - For some particular assignment, you need to compare two values, if both are equal, the result would be null, and if the values are not equal then the first value should be returned. Which function should you use?

A - NVL

B - NVL2

C - NULLIF

D - COALESCE

Q 4 - Which of the following is not a group function?

A - SUM

B - NVL

C - COUNT

D - MIN

Q 5 - Which of the following is not true about a subquery?

A - A subquery is a SELECT statement embedded in a clause of another SELECT statement.

B - The subquery executes before the main query.

C - The result of the main query is returned to the subquery.

D - All of the above.

Q 6 - Which of the following is true about removing rows from a table?

A - You remove existing rows from a table using the DELETE statement

B - No rows are deleted if you omit the WHERE clause.

C - You cannot delete rows based on values from another table.

D - All of the above.

Q 7 - Which of the following is not true about the ALTER TABLE statement?

A - It can add a new row.

B - It can add a new column.

C - It can modify existing columns.

D - It can define a default value for the new column.

Q 8 - Which of the following is not true about creating constraints?

A - Constraints are defined using the CREATE CONSTRAINT statement.

B - They are created at the same time when the table is created.

C - They could be created after the table is created.

D - All the constraints are stored in data dictionary.

Q 9 - Which of the following code will delete a sequence named loc_seq?

A - delete sequence loc-seq;

B - drop sequence loc_seq;

C - delete primary key loc_sec;

D - drop primary key loc_sec;

Q 10 - Which of the following code would create a role named student_admin?

A - CREATE student_admin;

B - GRANT student_admin;

C - CREATE ROLE student_admin;

D - ROLE student_admin;