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SQL INTERVIEW QUESTION & ANSWERS

Databases
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21. What is the purpose of Database systems?
  A Database Management system provides a secure and survivable medium for the storage and retrieval of data. In the real world, the data is shared among several users and is persistent.
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22. What is a cursor?
  A cursor serves as a pointer that allows the application programming language to deal with query results one row at a time. Although the cursor can traverse all the rows of a query result, it focuses on only one row at a time.
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23. What is meant by Metadata?
  Metadata are data about data but not the actual data.
  Posted by Sushree. (Dec 27, 2013)
 

A set of data that describes and gives information about other data.
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24. What is meant by data independence?
  The ability to modify a scheme definition in one level without affecting a scheme definition in the next higher level is called data independence.
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25. What are the two levels of data independence?
 
    There are two levels of data independence are :
  • Physical data independence
  • Logical data independence
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