I have created a Master Detail Crystal Report which display only that
master records from database that have related detail records and
left other master records which doesn't have details records. Now
there are total 314 records out of which only 12 master records have
their detail records in detail records table and Crystal report only display
that 12 records. Now I want every records from master tables should be
displayed eventhough it doesn't have detail records. Now how can I achive
this in Crystal Report for Visual Studio 2008.

Open Crystal Reposrts link tab.
Go to link option.
Use Outer join instead of Inner Join.
It will work.