Advanced Database Query Systems: Techniques, Applications by Li Yan, Zongmin Ma

By Li Yan, Zongmin Ma

Databases are designed to help facts garage, processing, and retrieval actions on the topic of facts administration. using databases in numerous functions has led to a huge wealth of knowledge, which populates many varieties of databases round the world.Advanced Database question structures: strategies, purposes and applied sciences makes a speciality of applied sciences and methodologies of database queries, XML and metadata queries, and functions of database question structures, aiming at supplying a unmarried account of applied sciences and practices in complicated database question platforms. This e-book presents the cutting-edge details for teachers, researchers and practitioners who're attracted to the learn, use, layout and improvement of complex and rising database queries with final goal of creating knowledge for exploiting the possibilities of the information and information society.

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From Figure 6 we can see that: Greedy- Refine algorithm performs greatly better than Greedy algorithm. The reason is that: the Greedy- Refine is executed on the queries which were arranged according 23 Automatic Categorization of Web Database Query Results Figure 7. Execution time for Q1 to Q4 to their cost in pre-processing phrase and makes twice greedy selection in processing phrase, so that it can obtain the near-globally optimization solution. Performance Report Figure 7 report the tree construction time of our algorithm for the 5 test queries (since the execution time of Q5 is much longer than the first 4 queries, we do not show its histogram in the figure).

Figure 1 shows a portion of the lattice of relaxations of q generated by SEAVE, where nodes indicate generalizations (or presuppositions) and arcs indicate generalization relationships. (x, y, z) denotes a query which returns the employees whose age is under x, whose sex is y, and whose yearly salary is at least z. The symbol * indicates any value; once it appears in a query, this query cannot be generalized any further. , q1, q3 and q8). Thus, the failed relaxed queries q1 and q3 are XGFs, whereas the successful relaxed queries q2, q4, q6 and q15 are MGSs.

Let v1 and v2 be children generated by a partition. Let Pi be the probability that users are interested in cluster Ci. The gain equals the reduction of category cost when v is partitioned into v1 and v2. Thus based on the category cost defined in Definition 2, the reduction of the cost of visiting tuples due to partition v into v1 and v2 equals 17 Automatic Categorization of Web Database Query Results N (t ) ∑ Cl ∩t ≠f Pl − ∑ N (t j )( ∑ Pi ) j =1,2 (9) C i ∩t j The decision tree construction algorithms do not consider the cost of visiting leaf tuples.

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