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Explain cursors in SQL?
Cursors in SQL - An object used to store the output of a query for row-through-row processing through the application programs. Cursors are constructs which enable the user to name a private memory field to hold an exact statement for access at a later time.
Cursors are used to procedure multi-row result sets one row at a time. In addition, cursors remain track of which row is currently being accessed, that permit for interactive processing of the active set.
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While sorting field groups we cannot use more than one key field False.
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These are the binary operations; i.e., each is applied to two relations or sets. These two relations can be union compatible excluding in case of Cartesian product. Two relations R
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