MS Access, SQL, Oracle, - which database i should choose?

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hello people, here i have an emergency question.. i am a final year electronics and communication engineering student, besides electronics i have a wide interest in learning software , i have completed C, C++ and JAVA now some people are asking me to study any database, i am confused which database i should chose, Oracle , SQL and MS Acess...which one will be easy to study and work and which one is being implemented in mnc's currently?? tell me the correct path, which database should i chose to work in an organization in the future?? or shall i join .NET Framework..