We have the set of MySQL interview questions and answers for experienced to freshers, which will help you to crack the MySQL interview.
Index
If you are looking for a DBA(Database Administrator) job, You must have good knowledge about Databases and MySQL queries. Please read the below MySQL interview questions carefully to achieve a great position as a database administrator.
Criteria | MySQL | SQL Server |
Developed by | Oracle | Microsoft |
Programmed In | C and C++ | Mainly C++, but some parts in C |
Platforms | Supports many platforms | Supports only Linux and Windows |
Syntax | Complex Syntax | Simpler and easy-to-use syntax |
Ans. The MySQL server is one of the famous and user-friendly database management system [DBMS]. It is developed and designed by Oracle. Database management systems are the computer system applications which can interact with users and various Database, too. Main objectives of MySQL Server are as follows.
Ans. 3306 is the default port for MySQL Server. 1433 is another standard default port used in TCP/IP for SQL Server.
Ans. User can download SQL Server for free and use it for developing SQL based applications. It is easy to understand and use as a user.
Ans. MySQL provides a wide range of interface and supports different cross-platforms for application programming. It supports many procedures like cursors and triggers that can be used for managing the Database.
Ans. DDL stands for data definition language which deals with different database schemas and descriptions about how Database resides in the Database. CREAT and ALTER table is the example of a DDL statement.
DCL stands for the data control language, which deals with different types of permissions for users. GRANT and REVOKE are examples of Data Control Language.
DML stands for data manipulation language, which deals with different manipulation statements like INSERT, SELECT and UPDATE of the data.
Ans. We can use joints for querying data from two or more tables. We can make a relationship between two or more column of existing tables. Four types of joints are used in MySQL. They are as follows:
Ans. When the user creates a table char type is used to define the fixed length of columns in the table. The length value must be in the range of 1-255. The varchar is the variable-length type which is used to adjust the column length of the table as per requirements.
Ans. The mentioned functions can be described as given below.
Ans. The syntax for concatenating tables in MySQL:
CONCAT (string 1, string 2, string 3)
Here string 1, string 2 and string 3 are strings which we want to concate as a string.
Read Also: Top 25 SQL Queries Interview Questions for Experienced
Ans. The below syntax is used for getting the current version of MySQL:
SELECT VERSION ();
Ans. In MySQL, We can use SET, BLOB, VARCHAR, TEXT, ENUM, and CHAR type of strings.
Ans. The maximum limit of indexed columns that can be created for any table is 16.
Ans. Yes, We can use MySQL with the Linux operating system as follows:
etc/init.d/mysqlstart
Ans. Yes, Object-oriented version of MySQL is possible. MYSQLi is one of the Object-oriented version of MySQL library function.
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Ans. The primary key is used to identify each row of a table uniquely. There can be more than one primary key. We can use the candidate key to reference the foreign keys. The primary key is one type of candidate key.
Ans. There are four different types of tables mainly used in MySQL.
Ans. Heap tables are used for high-speed temporary storage. But, TEXT and BLOB fields are not allowed within them. They do not support AUTOINCREMENT.
Ans. Percona XtraBackup is used to take an incremental backup in MySQL.
Ans. ENUM can limit the values that can go into a table. For instance, we can create a table giving specific day values and other day values would not enter into the table.
Ans. Following TRIGGERS are allowed in MySQL:
Ans. The identical difference between REGEXP and LIKE operators can be described as mentioned below.
Ans. When the password of the user is lost, the user should start the Database with skip-grants-table and then change the password. After that, the user should restart the DB with the new password in a normal mode.
Ans. There is a slight difference between DELETE TABLE and TRUNCATE TABLE as mentioned below.
So, the process is faster than DELETE TABLE in comparison. We can also roll back TRUNCATE TABLE, and it functionally is similar to the DELETE statement without a WHERE clause.
Ans. The storage models in OLAP are as follows.
Also read: Top 25 SQL Queries Interview Questions
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That is all for MySQL Interview Questions for experienced, and if you are a fresher, don’t worry if you were not able to answer some tricky questions. I am sure you will feel confident after preparing for the MySQL interview using this series of questions.
I hope you found this post informative.
Thank you for reading 🙂
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