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

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Database Management (1411)
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Databases Interview Questions

Questions Answers Views Company eMail

How many ways we can we find the current date using MySQL?

5 12793

How can increase the performance of MySQL select query?

RV Technologies, Span Systems,

3 11950

The structure of table view buyers is as follows: +----------------+-------------+------+-----+---------+----- -----------+ | Field | Type | Null | Key | Default | Extra | +----------------+-------------+------+-----+---------+----- -----------+ | user_pri_id | int(15) | | PRI | NULL | auto_increment | | userid | varchar(10) | YES | | NULL | | +----------------+-------------+------+-----+---------+----- -----------+ the value of user_pri_id the last row 2345 then What will happen in the following conditions? Condition1: Delete all the rows and insert another row then. What is the starting value for this auto incremented field user_pri_id , Condition2: Delete the last row(having the field value 2345) and insert another row then. What is the value for this auto incremented field user_pri_id

2 4822

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 78986

What is the difference between char and varchar data types?

6 48032

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

Sasaa,

7 15654

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 10922

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

Google,

9 26274

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

10 25944

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 14858

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 3764

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

Un-Answered Questions { Databases }

What are locks in sql?

980

How to use regular expression in pattern match conditions?

953

a table has 2 classifications 1)liabilities 2)earnings this liabitity has 2 elements with 2 input values and the earnings have 2 elements with 2 input values i wrote a query so that my input is liability savings amount1 amount2 xxxx null xxxxxx 0 xxx1 null xxxxx1 0 null yyyy 0 yyyy null yyy1 0 yyy1 my problem is --when i developed a report(d2k) with this data my o/p is liabilities,amount1,savings,amount2 xxxx xxxxxx xxx1 xxxxx1 yyyy yyyy yyy1 yyy1 how could i move this savings,savings values 2 palces up. can any body provide me witha better solution

2262

What is the dba role in oracle?

577

How to check dependency of table in postgresql?

855

How to provide values to stored procedure parameters in ms sql server?

1037

What is the difference between sum and count in sql?

986

What is metadata in mongodb?

How to list all tables in the database using odbc_tables()?

1052

What is triggers and how it can be used in mysql?

971

How oracle handles dead locks?

1066

Explain what is a subquery ?

1188

What is table normalization?

931

Explain the microsoft sql server delete command?

1018

How do I remove duplicate rows from a table in sybase?

907

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