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SQL INTERVIEW QUESTION & ANSWERS

Databases
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36. What is the purpose of the DISTINCT option?
  The DISTINCT option will suppress the display of duplicates.
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37. What does the precompiler do with the program file?
  The precompiler strips the SQL statements out of the host language code and replaces them with calls to the SQL statements.
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38. What is a query specification?
  A query specification is an SQL expression that begins with the SELECT keyword and includes a number of elements that form that expression.
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39. What are the three primary types of relationships supported by a relational database?
 
    There are three primary types of relationships are :
  • One–to–one
  • one–to–many
  • many–to–many
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40. Define Entity type, Entity set?
  An entity type defines a collection of entities that have same attribute Entity Set.
Entity set is the collection of a particular entity type that are grouped into an Entity Set.
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