How Long to Read Database Repairs and Consistent Query Answering

How Long Does it Take to Read Database Repairs and Consistent Query Answering?

It takes the average reader 1 hour and 47 minutes to read Database Repairs and Consistent Query Answering by Leopoldo Bertossi

Assuming a reading speed of 250 words per minute. Learn more

Description

Integrity constraints are semantic conditions that a database should satisfy in order to be an appropriate model of external reality. In practice, and for many reasons, a database may not satisfy those integrity constraints, and for that reason it is said to be inconsistent. However, and most likely, a large portion of the database is still semantically correct, in a sense that has to be made precise. After having provided a formal characterization of consistent data in an inconsistent database, the natural problem emerges of extracting that semantically correct data, as query answers. The consistent data in an inconsistent database is usually characterized as the data that persists across all the database instances that are consistent and minimally differ from the inconsistent instance. Those are the so-called repairs of the database. In particular, the consistent answers to a query posed to the inconsistent database are those answers that can be simultaneously obtained from all the database repairs. As expected, the notion of repair requires an adequate notion of distance that allows for the comparison of databases with respect to how much they differ from the inconsistent instance. On this basis, the minimality condition on repairs can be properly formulated. In this monograph we present and discuss these fundamental concepts, different repair semantics, algorithms for computing consistent answers to queries, and also complexity-theoretic results related to the computation of repairs and doing consistent query answering. Table of Contents: Introduction / The Notions of Repair and Consistent Answer / Tractable CQA and Query Rewriting / Logically Specifying Repairs / Decision Problems in CQA: Complexity and Algorithms / Repairs and Data Cleaning

How long is Database Repairs and Consistent Query Answering?

Database Repairs and Consistent Query Answering by Leopoldo Bertossi is 105 pages long, and a total of 26,775 words.

This makes it 35% the length of the average book. It also has 33% more words than the average book.

How Long Does it Take to Read Database Repairs and Consistent Query Answering Aloud?

The average oral reading speed is 183 words per minute. This means it takes 2 hours and 26 minutes to read Database Repairs and Consistent Query Answering aloud.

What Reading Level is Database Repairs and Consistent Query Answering?

Database Repairs and Consistent Query Answering is suitable for students ages 10 and up.

Note that there may be other factors that effect this rating besides length that are not factored in on this page. This may include things like complex language or sensitive topics not suitable for students of certain ages.

When deciding what to show young students always use your best judgement and consult a professional.

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