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ORACLE
  find the employee whose salaries greater than their respective dept. avarage salary ?
  what is the size of null value?
  what is composite primary key?
  what is candidte key in sql?
  how to display last 2 rows from a table ?
  write a query show the no. of employee details who earn more than their manager salaries ?
  what is difference between delete and truncate?
  HOW MANY COLUMNS CAN TABLE HAVE?
  What is difference between varchar and varchar2 ?
  What is RAID concept ?
  what is a field in a database ?
  What is ACID properties?
  What is primary key?
  What is difference between DBMS and RDBMS?
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