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Compare the Nested-loop join and block-nested loop join
Ans: Nested loop join - It is costly as worst case cost, no. of block accesses needed is nr * bs + br where bs and br denote no. of blocks containing ns and nr tuples of relations S and R, relevant and in best case there will be br + bs block accesses
Block-nested-loop join - In worst case no. of block accesses is br*bs + br. In best case, br +bs block accesses will be needed.
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What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.
what is lossless & dependency preserving decomposition ?
What is authorization graph? Passing of authorization from single user to another can be shown by an authorization graph.
State the Object Design for Processing The object design phase comes after analysis and system design phase. The object design phase includes implementation details like as i
Consider a typical sales invoice that would include the following information. Design a single table to hold all of the information required to store an invoice including this info
How is concurrency identified? Concurrency in objects can be identified by the way they alter their state. Current objects can change their state independently. Aggregation imp
What is use of generating such tables? How can you create temporary tables? When you require a table only for a short time after that you want it to disappear automatically you
Logical Operators Rules of Precedence: Order evaluated Operator 1 All comparison operators 2
What is the role of ORDER By Clause? ORDER BY clause: The ORDER BY clause permits you to sort the records in your result set. The ORDER BY clause can just be used in select s
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