Basic MySQL Interview Questions
1.What is Mysql?
- Database management system for web servers
2.What are some of the advantages of using MySQL?
- Flexibility
- Power
- Enterprise-Level SQL Feature
- Full-Text Indexing and Searching
- Query Caching
- Replication
- Configuration and Security
3.What do you mean by `Database`?
- A structured collection of data stored
- Organized to be quickly searched
- Information can be rapidly retrieved
4.What does SQL in MySQL stand for ?
- Structured Query Language
5.What does a MySQL database contain?
- one or more tables
- records and rows
- columns and fields
6.How can you interact with MySQL?
- using a command line
- via a web interface
- through a programming language
7.What are MySQL Database Queries?
- a specific request or a question
8.What are some of the common MySQL commands?
- Alter
- Backup
- \c (to cancel input)
- Create
- Delete
- Describe
- Drop
- Exit
- Grant
- Insert
- Lock
- Quit
- Rename
- Show
- Source
- Status
- Truncate
- Unlock
- Update
- Use
9.How do you create a database in MySQL?
Create Database database_name;
10.How do you remove a column from a database?
- Alter Table books drop pages;
11.How do you view a database in MySQL ?
- Show databases;
12.What are the Numeric Data Type in MySQL?
- TINYINT
- SMALLINT
- MEDIUMINT
- INT
- BIGINT
- DECIMAL
- FLOAT
- DOUBLE
- BIT
13.What are the String Data Types in MySQL?
- CHAR
- VARCHAR
- BINARY
- VARBINARY
- TINYBLOB
- BLOB
- MEDIUMLOB
- LONGBLOB
- TINYTEXT
- TEXT
- MEDIUMTEXT
- LONGTEXT
- ENUM
- SET
- NULL
14.What are the Temporal Data Type in MySQL?
- DATE
- TIME
- DATETIME
- TIMESTAMP
- YEAR
15.What is BLOB in MySQL?
- BLOB is an acronym that stand for a binary large object.
- It is used to hold a variable amount of data
- TINYBLOB
- BLOB
- MEDIUMBLOB
- LONGBLOB
- A BLOB can hold a very large amount of data.(document,images,videos)
16. How to add users in MySQL?
- CREATE USER 'testuser' IDENTIFIED BY 'sample password';
Intermediate MySQL Interview Questions
17. What are MySQL "Views"?
- a view consists of a set of rows that is returned
- virtual table
- making the query available via an alias
- Advantages of views : Simplicity Security Maintainability
18.What are MySQL Trigger?
- a task that executes in response to database event that involves inserting,modifying,or deleting table data
- Trigger purpose including Audit Trails and Validation and Referential Integrity enforcement
19.How many Triggers are possible in MySQL?
Six triggers allowed to use in the MySQL database:
- Before Insert
- After Insert
- Before Update
- After Update
- Before Delete
- After Delete
20.What is the MySQL server?
The server mysqld,is the hub of a MySQL installation,It performs all manipulation of databases and tables.
21.What are the MySQL clients and utilities?
- mysql (an interactive program enable client to server,execute bash shell )
- mysqladmin (An administrate program for performing tasks: shut down the server,checking its configuration,monitoring its status)
- mysqldump (backing up your database or copying database)
- mysqlcheck and myisamchk (perform table checking,analysis and optimization)
22.What are the types of relationships used in MySQL?
- One-to-One
- One-to-Many
- Many-to-Many
Advanced MySQL Interview Questions
23.Can you explain the logical architecture of MySQL?
- The top layer: contains the services most network-based client/server tools
- The second layer contains much of MySQL's brains
- The third layer contains the storage engines that are responsible for storing and retriveing the data stored in MySQL.
24.What is Scaling in MySQL?
- Quantity of data
- Number of users
- User activity
- Size of related datasets