Sql Interview Question and Answers

86. What is an Data Abtration?
 
    A major purpose of a database system is to provide users with an abstract view of the data.There are three levels of data abstraction
  • Physical level
  • Logical level
  • View level
 
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87. What is Transaction Manager?
  It is a program module, which ensures that database, remains in a consistent state despite system failures and concurrent transaction execution proceeds without conflicting.
 
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88. What kind of User-Defined Functions can be created?
  There are three types of User-Defined functions in SQL Server 2000 and they are Scalar, Inline Table-Valued and Multi-statement Table-valued.
 
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89. What are defaults? Is there a column to which a default can't be bound?
  A default is a value that will be used by a column, if no value is supplied to that column while inserting data. IDENTITY columns and timestamp columns can't have defaults bound to them. See CREATE DEFUALT in books online.
 
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90. What is data integrity?
  Data integrity is an important feature in SQL Server. When used properly, it ensures that data is accurate, correct, and valid. It also acts as a trap for otherwise undetectable bugs within applications.
 
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