MySQL mcq questions and answers | MySQL MCQs

In MySQL, the "Password" column in the grant tables, such as "mysql.user" table, is case insensitive. This means that when you grant or revoke privileges, the password is matched without considering the case sensitivity. This is particularly important for security reasons, ensuring that users can authenticate regardless of the case of their password input. Hence, Option C is correct.

The option that supplies the pathname to the root directory of the MySQL installation is -basedir. This option is used to specify the base directory where MySQL is installed. It is particularly useful in situations where you need to specify the location of various MySQL-related files or when starting MySQL from the command line. Hence, Option A is correct.

The "Equality conditions" operator in MySQL includes the = operator, which is used to check for equality between two values. It compares whether two expressions are equal. Therefore, Option C is correct. <> and != are not equality operators; they represent the inequality operator, meaning "not equal to". > and < represent the greater than and less than operators respectively, which are not equality conditions. Hence, Option C is the correct answer.

The durability property of transactions in MySQL refers to the guarantee that once a transaction is committed, its effects are recorded permanently and will not be lost, even in the event of a system failure. This means that the changes made by committed transactions will persist even after the system restarts or crashes. Therefore, Option D is the correct answer.

In MySQL's INFORMATION_SCHEMA database, the FILES table stores information about files on disk that relate to tables in databases managed by the MySQL server. This includes data files, index files, and other related files. The disk data stored in the FILES table pertains to the NDB (Network DataBase) storage engine, which is used in MySQL Cluster for high availability and scalability. Therefore, Option A is the correct answer.

Prior to MySQL 6.0, the utf8 character encoding used by MySQL could store characters using up to 3 bytes per character. This allowed for a wide range of characters to be represented, but it had limitations, particularly for characters outside the Basic Multilingual Plane (BMP). MySQL 6.0 introduced utf8mb4 as a new character set that supports up to 4 bytes per character, enabling the storage of the full range of Unicode characters. Therefore, Option A is the correct answer.

To sort the stored data in alphabetical order in MySQL, you use the ORDER BY clause. This clause is used in SELECT queries to sort the result set based on specified columns, either in ascending (default) or descending order. Therefore, Option A is the correct answer.

In MySQL, triggers and events are database objects that are automatically invoked or executed by the server based on certain conditions or events. Triggers are activated in response to specific actions, such as INSERT, UPDATE, or DELETE operations on a table, while events are scheduled tasks that run at specified times or intervals. Since triggers and events are executed automatically by the MySQL server, Option A, "True," is the correct answer.

In MySQL, a VIEW is a virtual table that does not store any actual data on its own but instead is based on the result set of a SELECT query. It behaves like a regular table in many aspects, allowing users to query, insert, update, and delete data from it, depending on the permissions granted. However, the underlying data of a VIEW is derived dynamically from the tables or other views it references. Therefore, a VIEW is also known as a virtual table. Hence, Option D is the correct answer.

MySQL provides various constants and functions to retrieve information about the MySQL server and client. In this question, we are asked to identify an alternative to MYSQL_SERVER_VERSION.

The correct option is Option C: MYSQL_VERSION_ID.

Explanation:
LIBMYSQL_VERSION: This constant represents the version of the MySQL client library.
LIBMYSQL_VERSION_ID: This constant represents the numeric version of the MySQL client library.
MYSQL_VERSION_ID: This constant represents the numeric version of the MySQL server.
MYSQL_ID: There is no such constant in MySQL.

Therefore, Option C: MYSQL_VERSION_ID is the appropriate alternative to MYSQL_SERVER_VERSION.