MySQL Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

MySQL Interview Questions

Questions Answers Views Company eMail

What are the advantages and disadvantages of MySQL?

Satyam,

3768

What is the difference between GROUP BY and ORDER BY in Sql?

Creative, Renault Nissan, Trikon Networks,

12 79399

What is the difference between char and varchar data types?

6 48278

How to load data from a text file into a table?

Sasaa,

7 15946

How can we know the number of days between two given dates using MySQL?

Base2 Infotech, Webworks,

2 7828

How can we change the name of a column of a table?

7 11151

How can we change the name and data type of a column of a table?

Google,

9 26597

What are the differences between drop a table and truncate a table?

10 26283

A select query over a large table runs very slow because of the growing number of entries in that table. What different measures could be taken to improve speed?

5 15059

A company wants to store their invoices in a database. They already have their customers and articles in that database. Both customer and article are each identified by an unique integer value. Please create the SQL statements for creating the necessary table(s) for storing the invoices in a MySQL database. An invoice should hold information like invoice number, customer, date, article(s) and quantity etc.

1 4601

For the database from the previous question, please give an SQL query which returns the invoice number of all invoices which contain the article with the number ?1234?. The query should be able to run under a MySQL 4.0 database.

1 3836

How would you backup and restore a big MySQL database? What are the advantages of the approach which you have taken over the others?

4 11209

What are the differences between MySQL_fetch_array(), MySQL_fetch_object(), MySQL_fetch_row()?

2 8510

Explain MySQL optimization?

1 6170

The table tbl_sites contains the following data: ----------------------------------------------------- Userid sitename country ------------------------------------------------------ 1 sureshbabu indian 2 PHPprogrammer andhra 3 PHP.net usa 4 PHPtalk.com germany 5 MySQL.com usa 6 sureshbabu canada 7 PHPbuddy.com pakistan 8. PHPtalk.com austria 9. PHPfreaks.com sourthafrica 10. PHPsupport.net russia 11. sureshbabu australia 12. sureshbabu nepal 13. PHPtalk.com italy Write a select query that will displayed the duplicated site name and how many times it is duplicated?

Afixi, GE,

4 9927

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Un-Answered Questions { MySQL }

What is foreign key in mysql?

1095

What is the hostname for mysql database?

1073

How do I start mysql server?

953

What is an index? How can an index be declared in mysql?

940

What is unsigned int in mysql?

989

What are the differences between innodb and myisam engines?

1044

What is the full form of mysql?

1065

How to create a trigger in mysql?

981

What are the functions of commit and rollback statements?

1108

What is regex in mysql?

1151

What is the full meaning of mysql?

1019

What are the functions used to encrypt and decrypt the data present in mysql?

1186

What do you understand by mysql terminal?

1107

How to change the database engine in mysql?

1076

How do I find the size of a mysql database?

971

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