COMPUTER Networks for eg(ip address , internet, ram rom memory location , can a device has ip address ,database definition what is data etc)
sql( inner joins query join 3 table , view definition)
java(oops , multithreading , exception handling how many final we can have in one try catch , can we have multiple catch and try blocks, static keyword , finalize , diff between public and protected , static binding , late binding he has written code and asked whether it will work or not )
one pattern
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