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Welcome to the Query Optimization MCQs Page

Dive deep into the fascinating world of Query Optimization with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Query Optimization, a crucial aspect of MySQL Database. In this section, you will encounter a diverse range of MCQs that cover various aspects of Query Optimization, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within MySQL Database.

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Check out the MCQs below to embark on an enriching journey through Query Optimization. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of MySQL Database.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Query Optimization. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Query Optimization MCQs | Page 7 of 9

Q61.
Which command is used to remove existing tables or database?
Discuss
Answer: (a).DROP TABLE
Q62.
Which command is used to display all the existing tables in a database?
Discuss
Answer: (a).SHOW TABLES
Q63.
Is duplicate entry of primary key is allowed in SQL?
Discuss
Answer: (b).No
Q64.
Is duplicate entry of other attributes are allowed in SQL?
Discuss
Answer: (a).Yes
Q65.
Which is the correct format to store date in the SQL?
Discuss
Answer: (d).1991-11-01
Q66.
Which of the following are the valid “database datatypes” in Mysql?
Discuss
Answer: (d).All of the mentioned
Q67.
Find the error in the following SQL statement?
CREATE TABLE person
( person_id SMALLINT, name VARCHAR, LAST VARCHAR
  CONSTRAINTS pk_person PRIMARY KEY (person_id));
  INSERT INTO person
  VALUES( person_id, name, LAST)
  (1, ’s’, ’p’);
  INSERT INTO person
  ( person_id, name, LAST)
  VALUES(1,’s’,’p’);
Discuss
Answer: (b).Error, Duplicate value
Q68.
Find the error in the following SQL statement?
  CREATE TABLE person
  ( person_id SMALLINT, name VARCHAR, LAST VARCHAR, Bith_date DATE
  CONSTRAINTS pk_person PRIMARY KEY (person_id));
  INSERT INTO person
  VALUES( person_id, name, LAST, Birth_date)
  (1,’s’,’p’, 24-1991-01);
Discuss
Answer: (a).In correct data value
Q69.
Which Key is used to link two tables in Mysql?
Discuss
Answer: (b).Foreign Key
Discuss
Answer: (d).None of the mentioned
Page 7 of 9

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