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SQL INTERVIEW QUESTION & ANSWERS

Databases
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96. What are some of the reasons differences in SQL exist?
  Differences exist in SQL among the vendors because of storage requirements, advantages over competitors, ease of use, and performance considerations.
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97. What statement must you include in your CREATE TRIGGER statement if the trigger definition includes more than one triggered SQL statement?
  BEGIN...END statement
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98. Describe the three levels of data abstraction?
 
    The are three levels of abstraction :
  • Physical level : The lowest level of abstraction describes how data are stored.
  • Logical level : The next higher level of abstraction, describes what data are stored in database and what relationship among those data.
  • View level : The highest level of abstraction describes only part of entire database.
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99. What type of view does the WITH CHECK OPTION clause apply to?
  The WITH CHECK OPTION clause applies to updatable views that include a WHERE clause in the SELECT statement.
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100. What is XML?
  XML is a general-purpose markup language used to describe documents.
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