Describe the three levels of data abstraction?

• physical level- describe how the data are stored
  logical level-describe what data are stored
  view level-describe only the part of the entire database
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• PROCESSES RESIDING IN MEMORY BUT THAT HAVE NOT BEEN ALLOCATED CPU ARE SAID TO BE IN READY QUEUE
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• physical level
  logical level
  view level
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• when the processes which is kept in the queue to execute their process in the critical section is called ready queue.
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• the process which need cpu to execute or kept in this queue . and They will be fetched from disk and loaded into main memory. and the process will wait for their time to get cpu
  
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• Here n is nth maximum salary n could be 1 2 3 4
  Select distinct sal from emp a where &n=(Select count (distinct sal) from emp b where a.sal
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