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

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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 12824

How can increase the performance of MySQL select query?

RV Technologies, Span Systems,

3 11978

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 4856

What are the advantages and disadvantages of MySQL?

Satyam,

3715

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

Creative, Renault Nissan, Trikon Networks,

12 79092

What is the difference between char and varchar data types?

6 48095

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

Sasaa,

7 15718

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

Base2 Infotech, Webworks,

2 7745

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

7 10997

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

Google,

9 26358

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

10 26032

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 14902

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 4538

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 3782

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 11073

Un-Answered Questions { Databases }

IS it possible to built the oracle database without setting the kernal parameters?

2360

WHEN CURSOR MOVES FROM ONE FORM TO ANOTHER FORM, HOW MANY TRIGGER WILL BE FIRED AND WHAT ARE THEIR SEQUENCE?

2328

What is the candidate key used for?

1109

What are the types of Knowledge Modules?

604

how would you convert a secondary server into a primary server ?

182

Define and explain about progress?

945

Is sql similar to mysql?

916

What are tuples in sql?

1155

Write the order of precedence for validation of a column in a table? I. Done using database triggers. Ii. Done using integarity constraints

1092

what rules exist regarding format, content, flame wars, etc

What do you understand by data redundancy?

936

What are the triggers in sql?

1120

How do you handle datasets larger than 50 gb?

162

Which kind of parameters cannot have a default value in pl sql?

1160

How do I select a table in mysql?

949

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