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Why are cursors necessary in embedded SQL?
A cursor is an object used to store the output of a query for row-by-row processing through the application programs. SQL statements operate on a set of data and return a set of data. Instead, host language programs operate on a row at a time.
The cursors are used to navigate by a set of rows returned through an embedded SQL SELECT statement. A cursor could be compared to a pointer.
Explain I command in QBE ? I : It is the command in QBE that is used to insert tuple (s) into the database
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For the relations R and S given below: R S A B C 1 4 7 2 5 8 3 6 9
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