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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 names of all the students whose email ids are not provided?
A - select first_name, last name from students where email = 0;
B - select first_name, last name from students where email = â â;
C - select first_name, last name from students where email is null;
D - select first_name, last name from students where email = ânullâ;
Answer : C
Q 2 - What is returned by SUBSTR(âTUTORIALS POINTâ, 1, 9)?
Answer : C
Q 3 - Which of the following is true about SQL joins?
A - The join condition is not separated from other search conditions in a query.
B - The ON clause makes code difficult to understand.
C - The join condition for natural join is basically an equijoin of all columns with same name.
Answer : C
Q 4 - Which of the following functions can be used on both numeric as well as non-numeric data?
Answer : A
Q 5 - Which of the following is true about subqueries?
A - Subqueries could be used for Top-N analysis.
B - Subqueries can be of two types â single-row subquery and multiple-row subquery.
C - The outer and inner queries can get data from different tables.
Answer : D
Q 6 - Which of the following is not true about inserting news rows to a table?
A - The INSERT INTO statement is used for inserting new rows to a table
B - You cannot insert rows with NULL values to a table.
C - You may insert a new row containing values for each column.
Answer : B
Q 7 - Consider the following schema −
LOCATIONS(subject_code, department_name, location_id, city);
Which code snippet will alter the table LOCATIONS and add a column named Address, with datatype VARCHAR2(100)?
A - ALTER TABLE locations ADD (address varchar2(100));
B - ALTER TABLE locations ADD COLUMN(address varchar2(100));
C - MODIFY TABLE locations ADD COLUMN (address varchar2(100));
Answer : A
Q 8 - Which of the following code will successfully delete the table LOCATIONS from the database?
Answer : A
Q 9 - Which of the following is true about database indexes?
A - You can create an index on one or more columns.
B - Indexes always slow down the speed of query process.
Answer : A
Q 10 - Which of the following is not a developerâs privilege?