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Ways for Selecting Data Structure
Algorithms operate on data structure. Therefore, selection of the best algorithm means selecting the best data structure from whole bunch. The data structures do not add any information to analysis model, but they systematize it in a form which is convenient for algorithms which uses it. Many such data structure contains lists, arrays, stacks, queues, trees etc.
Some variations on these data structures are main concern queues, binary trees etc. Most of the object oriented languages provide different sets of generic data structures as part of their already defined class libraries.
What is D command work in the respect of QBE? D: It is the command inside QBE to delete tuple(s) from the relation.
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Define shadow paging. An alternative to log-based crash recovery method is shadow paging. This technique requires fewer disk accesses than do the log-based methods.
What is a PROJECT operation? The project operation is a unary operation that returns its argument relation with particular attributes left out. Projection is shown by pie (π).
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