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,

3699

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

Creative, Renault Nissan, Trikon Networks,

12 78983

What is the difference between char and varchar data types?

6 48027

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

Sasaa,

7 15653

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

Base2 Infotech, Webworks,

2 7720

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

7 10920

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

Google,

9 26273

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

10 25938

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 14856

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 4510

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 3762

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 11034

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

2 8402

Explain MySQL optimization?

1 6067

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 9763

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Un-Answered Questions { MySQL }

how can you test for null values in a database? : Mysql dba

937

What is the difference between mysql_fetch_assoc and mysql_fetch_array?

1070

How to change a password for an existing user via mysqladmin?

982

What is a csv table?

1001

What is federated tables in mysql?

910

HOW TO FIND display the total number of weeks in the year of 1998 IN EMP TABLE

2227

Can a table have multiple primary keys?

901

What is difference between oracle sql and mysql?

1016

What is innodb mysql?

1084

How do I check mysql version?

1041

How to write after insert event update trigger on the same table in mysql?

957

What is ibdata1?

909

Is mysql distributed?

926

Is Mysql query is case sensitive?

1023

How do I zip a file in mysql?

980

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