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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.
Describe the two types of methods for retrieving rows in Python? Fetchone()- Returns the next row as a sequence Fetch all()- Returns the entire result set like a strin
Explain the components of Database System in details.
Determine Which is not a consequence of concurrent operations? Ans: Update anomaly.
what is view?explain
What is schema
What is the use of keyword ISA? The use of keyword ISA is to show that a class is a specialization of another class.
State The position of object at any moment is called state. An object can have many states depend upon time. After receiving some input instructions, the object can change its
A set of possible data values is called? A set of possible data values is called as domain.
Define the five basic operators of relational algebra? Five basic operators of relational algebra are: 1. Union (∪∪∪∪) - Selects tuples which are in either P or Q or in both
XYZ is a large chain of home entertainment rental over 100 stores distributed over all states in Australia. XYZ lends entertainment products such as movies, TV shows and games on v
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