Top 50 MySQL Interview Questions & Answers

Introduction: MySQL Interview Questions MySQL is an essential part of Database systems. For a career in Data Science, Data Analytics and Data Warehousing, good knowledge of MySQL is required. This book contains MySQL Technical interview questions that you can expect in a Technical interview. MySQL is a very important topic in technical interview. Many fortune 500 organizations use MySQL. This book contains basic to expert level MySQL interview questions that an interviewer asks. Each question is accompanied with an answer so that you can prepare for job interview in short time. Often, these questions and concepts are used in our daily programming work. But these are most helpful when an Interviewer is trying to test your deep knowledge of MySQL concepts. How will this book help me? By reading this book, you do not have to spend time searching the Internet for MySQL interview questions. We have already compiled the list of the most popular and the latest MySQL Interview questions. Are there answers in this book? Yes, in this book each question is followed by an answer. So you can save time in interview preparation. What is the best way of reading this book? You have to first do a slow reading of all the questions in this book. Once you go through them in the first pass, mark the questions that you could not answer by yourself. Then, in second pass go through only the difficult questions. After going through this book 2-3 times, you will be well prepared to face a technical interview for Software Engineer position in MySQL. What is the level of questions in this book? This book contains questions that are good for a Associate Software engineer to a Principal Software engineer. The difficulty level of question varies in the book from a Fresher to an Experienced professional. What are the sample questions in this book? How will you calculate the number of days between two dates in MySQL? What are the different types of Triggers in MySQL? What are the differences between Heap table and temporary table in MySQL? What is a Heap table in MySQL? What is the difference between BLOB and TEXT data type in MySQL? What will happen when AUTO_INVREMENT on an INTEGER column reaches MAX_VALUE in MySQL? What are the advantages of MySQL as compared with Oracle DB? What are the disadvantages of MySQL? What is the difference between CHAR and VARCHAR datatype in MySQL? What is the use of 'i_am_a_dummy flag' in MySQL? How can we get current date and time in MySQL? What is the difference between timestamp in Unix and MySQL? How will you limit a MySQL query to display only top 10 rows? What is automatic initialization and updating for TIMESTAMP in a MySQL table? How can we get the list of all the indexes on a table? What is SAVEPOINT in MySQL? 17. What is the difference between ROLLBACK TO SAVEPOINT and RELEASE SAVEPOINT? Why this query does not work in MySQL? What is mysqldump? What is the limitation of mysqldump? Can we run Javascript or Python code in MySQL? What are user-defined variables in MySQL? How will you optimize a SELECT query in MySQL? What are the different optimization techniques in MySQL? How can we optimize INSERT query in MySQL? How will you make MySQL system secure against attackers? How can you protect your MySQL server against Denial of Service attacks?

Author: Knowledge Powerhouse

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