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SQL Online Quiz
Following quiz provides Multiple Choice Questions (MCQs) related to SQL. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the 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 âiâ?
A - select first_name from students where first_name like â_i%â;
B - select first_name from students where first_name like â%i_â;
C - select first_name from students where first_name like â%i%â;
D - select first_name from students where first_name like â_i_â;
Answer : A
Q 3 - Which of the following is not true about the COALESCE function?
A - It takes multiple alternate values.
B - It returns the first non-null expression in the parameter list.
C - It returns the first value in the parameter list if it is null.
Answer : C
Q 5 - Which of the following is not true about single-row subqueries?
A - Single row subqueries return one row from the inner SELECT statement.
B - Single row subqueries return one row from the outer SELECT statement.
C - Single row subqueries use single-row comparison operators.
Answer : B
Q 6 - In which of the following cases a DML statement is executed?
A - When new rows are added to a table.
Answer : A
Q 7 - Which of the following is NOT true about the SQL transaction control statements?
A - The COMMIT statement ends the current transaction and makes all data changes permanent.
B - The ROLLBACK statement ends the transaction and discards all the pending data changes.
Answer : C
Q 8 - 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 code will create a simple view named all_marks_english that contains the names and percentage of marks of the students in the honours_subject âEng01â?
Answer : A
Q 9 - Which of the following code will delete a view named all_marks_english?
A - delete view all_marks_english;
Answer : B
Q 10 - Which of the following is not a developerâs privilege?