MySQL Interview Questions and Answers
MySQL Interview Questions and Answers
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Best MySQL Interview Questions and Answers
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Q1) Define MySql
Answer: MySql, an open-source Database Management System. MySql AB (assimilated by Oracle) is the one that constructed, maintained, and circulated MySql.
Q2) List out the benefits of MySql
Answer: MySql has the below benefits:
- Easy to use
Q3) When compared with Oracle, what are the advantages of MySql?
Answer: Below is the advantages of MySql when compared with Oracle:
- No charges involved as it an opensource tool
- Affords a GUI along with command prompt
- MySql is a portable
- MySql Query Browser takes care of the administration
Q4) Which command is used to add a row in a database?
Answer: INSERT is the command used to add a row.
Q5) Which command is used to remove rows from a table ‘SAMPLE’?
Answer: DELETE FROM SAMPLE WHERE …
Q6) Define SQL WHERE clause
Answer: SQL WHERE clause restricts the row data that are returned.
Q7) What is the major purpose of SQL?
Answer: To stipulate syntax and semantics of SQL data definition language, manipulation language and to describe the data structures.
Q8) What is a VIEW in SQL language?
Answer: The VIEW command is used to access a virtual table through SQL commands.
Q9) What command is used to remove a table from a database?
Answer: DROP TABLE is the command used to remove from a database.
Q10) Which is considered as an effective SQL query for an Index?
Answer: CREATE INDEX ID is the query used for an Index.
Q11) What are the string types used for columns?
Answer: The string types are,
Q12) How to login to MySql through Unix shell?
Answer: You can login using the below command,
# [MySql dir]/bin/MySql -h hostname -u <UserName> -p <password>
Q13) How to regulate the maximum size of a HEAP table?
Answer: The variable named ‘max_heap_table_size’ is used to control the size of a HEAP table.
Q14) Define federated tables
Answer: Federated table permits access to the tables that are available on other databases on different servers.
Q15) Mention different table types available in MySql
Answer: The table types are:
- INNO DB
Q16) Define ISAM
Answer: ISAM (Indexed Sequential Access Method) was established by IBM to retrieve and store data on secondary storage systems.
Q17) What is the way to display the top 50 rows?
Answer: To display the top 50 rows, use the command given below:
SELECT * FROM
LIMIT, 0, 50;
Q18) Using CREATE command, what are the objects can be created
Answer: The objects are,
Q19) Mention the triggers used in MYSQL Table
Answer: The available triggers are,
- BEFORE INSERT
- AFTER INSERT
- BEFORE UPDATE
- AFTER UPDATE
- BEFORE DELETE and
- AFTER DELETE
Q20) What is a TEXT in MYSQL?
Answer: TEXT is said to be a case-insensitive BLOB. They are defined as a non-binary string. TEXT holds a character sets and values that are stored, and it is related based on the organization of the character set.
Q21) Mention the nonstandard string types
Answer: The Non-standard string types are,
Q22) What is BLOB?
Answer: BLOB defines a large binary object which is used to hold a flexible volume of data.
Q23) Mention the 4 types of BLOB in MYSQL
Answer: The available BLOB types are,
Q24) Mention one difference between temporary table and heap table
Answer: Temporary tables do not have the sharing options while the heap tables can be shared amount of different clients. Heap tables are considered as a storage point while a temporary one fails in storing the data.
Q25) Mention any 2 advantages of MYSQL to Oracle
Answer: The advantages are,
- MYSQL works great for database enabled items while Oracle is written for enterprises.
- MYSQL is portable and user-friendly.
- MYSQL consumes 1MB of RAM usage while Oracle uses more than 100 MB on your laptop.
Q26) Mention the query used to get current date in MYSQL
Answer: The query used to get the current date is,
SELECT CURRENT_DATE ();
Q27) Define save point concept in MySql
Answer: SAVEPOINT is defined as a statement in MySql to obtain a baptized transaction savepoint along with an identifier name.
Q28) List the column comparison operators used in MYSQL
Answer: The comparison operators are <<, <>, >=,>>, AND, LIKE, OR, <=, >, etc.
Q29) Which is the default port available in MYSQL?
Answer: 3306 is the default port allocated in MYSQL.
Q30) Define Primary key
Answer: To locate and identify a row in a table, a primary key is essentially used in the MySql server.
Q31) What is a candidate key?
Answer: A candidate key is defined as a set of columns that is majorly used to find any records in the MySql database without any need of a reference to data.
Q32) List the available drivers in the database
Answer: The available drivers in MYSQL are,
- PYTHON Driver
- JDBC Driver
- CAP11PHP Drive
- C WRAPPER
- ODBC Driver
- RUBY Driver
- PHP Driver
- PERL Driver
Q33) Define DML in MYSQL
Answer: Data Manipulative Language (DML) manages processes and data handlings. Few examples of DML commands include Insert and select.
Q34) Define DCL
Answer: Data Control Languages (DCL) is nothing but a permission concept. In other words, the approval to access various parts of a database.
Q35) What is the query used to concatenate strings?
Answer: To concatenate use the below query:
CONCAT (example string1, example string2, example string3)
Q36) Define foreign key
Answer: It is single or multiple columns that have values that are linked to a primary key to a different table.
Q37) Explain Index
Answer: Index is referred to 1 or many columns defined to have the values arranged uniquely manner to enhance data retrieval velocity.
Q38) Define rollback concept
Answer: Rollback concept helps to dismiss an operation or transaction while the database variations not protected to the MYSQL server.
Q39) Mention the groups of data types available in MYSQL
Answer: The three types are,
- Date & Time data
- String data types
Q40) Give a few examples of Numeric data types used in MYSQL
Answer: Numeric data types are,
Q41) Give a few examples of String data types used in MYSQL
Answer: Available String data types are,
Q42) Mention Time and Date data types available
Answer: Time and Date data types are,
Q43) Give the SQL command to retrieve indexes from a table named ‘employee’
Answer: The command used to retrieve indexes from a given table is ‘SHOW INDEX FROM employee’.
Q44) Mention a way to drop existing View
Answer: The view can be deleted by using the command, ‘DROP VIEW viewName’.
Q45) Explain Data Warehousing
Answer: A Data Warehousing is simply defined as a central Data storehouse, formed using diverse Data Sources.
Q46) List some common functionalities with MYSQL
Answer: The common functions used with MYSQL are,
Q47) What is the numeric limit on indexed columns creation to a table?
Answer: 16 indexed columns can be created as a maximum limit.
Q48) How a user can get the current version of MYSQL application?
Answer: The syntax ‘SELECT VERSION ();’ is used to know the current version of MYSQL.
Q49) Mention the advantage of ENUM in a database
Answer: ENUM in MYSQL helps to condense the values/data that can enter a table.
Q50) Mention OLAP storage models available
Answer: The three models are,
- HOLAP and