I am planning to learn any other data base. can any one help me which database is very much needed in now a days market?

The most common databases are Oracle, Microsoft SQL Server, MySQL, PostgreSQL and SQLite. Once you have a good grasp of the basic SQL concepts, then it is not too difficult to learn the specifics of these other databases.

Most Reliable and Costly: Oracle

Free and widely used: MySql

 These days the most commonly used type in databases 

SQL server 

there is some tool for that as 

xampp, wampp

You can start learining MySql, Its very easy to learn and has the below advantages :

MySQL is a free, open-source database management system (DBMS for short). A DBMS is a system that manages databases and connects them to software. For example, a MySQL database can be used to run a website, to run the database of an ERP or any other software.MySQL is a powerful, free open-source database management system that has been around for years. It is very stable and has a big community that helps maintain, debug and upgrade it.MySQL might not be as popular for larger systems that will mostly run on Microsoft SQL Server or Oracle. These proprietary DBMS are more scalable, have more resources available on the market and have more advanced features that MySQL.

Rank         DBMS                         Database Model            Score           Changes

1.Oracle                        Relational DBMS           1485.12         -15.80

2.MySQL                        Relational DBMS           1295.78        -13.77

3.Microsoft SQL ServerRelational DBMS           1246.60        +22.81

4.PostgreSQL                Relational DBMS           239.46                -0.53

5.MongoDB                 Document store           238.78                +7.33

6.DB2                        Relational DBMS           202.01               +3.98

7.Microsoft Access        Relational DBMS          144.62               +2.26

8.SQLite                        Relational DBMS           91.16               +1.97

9.Sybase ASE                Relational DBMS           83.72               +3.03

10.Cassandra              Wide column store   81.58               -0.26

http://db-engines.com/en/ranking

Dear VIGNESH 

The basic concepts of all databases are almost same, first of all you need analysis ask question  yourself that why you need to learn database

Like

1.      Are you already employed somewhere and want to use your skill for better data management

2.      Are you looking for database related job

3.      What is your current knowledge in computer science and databases?

4.      Are you looking database development side or data administration side?

5.      How much time you have for this learning?

So after this answer I can able to guide you and give you career oriented answer ..Meanwhile you can read and  guied book that i wrote for database learners who wanted to start their careers in database or database experts who want to start there new database projects and confuse between different database software ,in this guide book I compare basic futures like there data storage capacity ,cost availability

http://www.scribd.com/doc//Comparison-of-the-Common-diffrent-Database-Systems-by-Shahzad-Asghar

If you need more support please drop me few lines   

Oracle, Mysql, Sql Server

I think......

Are you in the market as a developer who writes programs accessing a database ?  Well, in that case, you may start with learning SQL and PL/SQL if you want to get into Oracle Applications Developer positions.

I am an Oracle Applications Database Administrator and it is common knowledge that Oracle is the number 1 datbase product in the market.  A DBA manages and adminsters Datbases only. An Oracle Applications DBA also administers Oracle Applications along with it. Oracle Applications is known as Oracle E-Business suite.

SQL Server is needed in Mediium to Large enterprises. Also NoSQL is evloving.

database systems provide a number of other properties that make them exceptionally useful and convenient: reliability, efficiency, scalability, concurrency control, data abstractions, and high-level query languages. 

The most common databases are Oracle, Microsoft SQL Server, MySQL, PostgreSQL and SQLite. Once you have a good grasp of the basic SQL concepts, RDMS, In addition to persistence, database systems provide a number of other properties that make them exceptionally useful and convenient: reliability, efficiency, scalability, concurrency control, data abstractions, and high-level query languages. Then it is not too difficult to learn the specifics of these other databases.

So far the administration point of view you should learn about microsoft technologies in database like SQL Server. In other perspective the technology in database is going towards NO SQL means non RDBMS. you should learn about the technologies dealing with Big Data like Hadoop. if you get command on it, Data Scientist is your destination.

If you want to grab big corporate opportunity get certified in DB2, Terradata etc.

Thanks