81. Which of the following operations need the participating relations to be unon compatible?
82. To delete a particular column in a relation the command used is:
83. A report generator is used to
84. The database environment has all of the following components except:
85. Count function in SQL returns the number of
86. It is possible to define a schema completely using
87. _________ is a virtual table that draws its data from the result of an SQLSELECT statement.
88. Which one of the following is not true for a view:
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