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SQL INTERVIEW QUESTION & ANSWERS

Databases
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31. Can multiple conditions be used in the WHERE clause?
  Yes. multiple conditions can be specified in the WHERE clause of SELECT, INSERT, UPDATE, and DELETE statements.
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32. Is SQL a procedural or non-procedural language?
  SQL is non-procedural, meaning that the database decides how to execute the SQL statement. The extensions discussed during this hour were procedural.
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33. Define the term data dictionary?
  Data dictionary is a repository of information describing the data in the database, that is the metadata. Data dictionary is a file that contains Metadata or data about data.
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34. What are the various types of databases?
 
    The different types of databases are:
  • Multimedia database
  • Spatial database (Geographical Information System Database)
  • Real–time or Active Database
  • Data Warehouse or On–line Analytical Processing Database
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35. Define Data Model?
  It is a collection of concepts that can be used to describe the structure of a database. The datamodel provides necessary means to achieve the abstraction i.e., hiding the details of data storage.
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