Last edited by Kigagami
Friday, May 1, 2020 | History

2 edition of Multivalued dependencies and a normal form for XML. found in the catalog.

Multivalued dependencies and a normal form for XML.

Yuanyuan Zhang

Multivalued dependencies and a normal form for XML.

  • 166 Want to read
  • 20 Currently reading

Published .
Written in English


About the Edition

In this thesis we proposed a definition for multivalued dependencies (MVDs) in XML. As in relational databases, MVDs in XML generalize functional dependencies (FDs) and suggest that the XML database can be losslessly decomposed into smaller databases. The main goal of identifying MVDs in XML is to detect the potential redundancy they may cause. We propose an XML Normal Form, XNFM, to address the redundancy issue related to MVDs. XNFM generalizes 4NF and coincides with nested normal form (NNF) for nested schemas. It is an extension of XML normal form (XNF), and thus a more powerful normal form. The normalization algorithm to convert an arbitrary XML document type definition (DTD) into a normalized one, in XNFM, is also introduced. We show that the algorithm outputs a lossless decomposition of the original DTD and the transformations in the algorithm can be implemented by using XQuery, an XML query language developed by the World Wide Web Consortium.As the World Wide Web becomes a major means of disseminating and sharing information, eXtensible Markup Language (XML) is rapidly emerging as a dominant standard for representing and exchanging data in the Internet. Meanwhile, the request and interest in efficiently storing and querying XML repositories has increased.

The Physical Object
Pagination103 leaves.
Number of Pages103
ID Numbers
Open LibraryOL19512437M
ISBN 100612952886


Share this book
You might also like
Housing manual 1944

Housing manual 1944

Scalp acupuncture

Scalp acupuncture

Changing to third party logistics

Changing to third party logistics

Economic and policy implications of proposed arms sales or transfers to the Persian Gulf

Economic and policy implications of proposed arms sales or transfers to the Persian Gulf

Paul, Apostle of Christ

Paul, Apostle of Christ

The scare fair

The scare fair

Voices from Ethiopia

Voices from Ethiopia

Superfund

Superfund

At a meeting held on October 18th 1934 the Employers representatives proposed that the standard rates in federated works be advanced ....

At a meeting held on October 18th 1934 the Employers representatives proposed that the standard rates in federated works be advanced ....

What wood is that?

What wood is that?

Waste not, want not, or, Two strings to your bow

Waste not, want not, or, Two strings to your bow

Reforming land and resource use in South Africa

Reforming land and resource use in South Africa

Problems in marketing

Problems in marketing

Bonnet House

Bonnet House

Non-means tested benefits

Non-means tested benefits

condition of our national political parties

condition of our national political parties

Principles of zoölogy

Principles of zoölogy

Multivalued dependencies and a normal form for XML. by Yuanyuan Zhang Download PDF EPUB FB2

A multivalued dependency is a special case of a join dependency, with only two sets of values involved, i.e. it is a binary join dependency. A multivalued dependency exists when there are at least three attributes (like X,Y and Z) in a relation and for a value of X there is a well defined set of values of Y and a well defined set of values of Z.

In this paper we define multivalued dependencies in XML (XMVDs). We then propose a normal form for XML documents in the presence of XMVDs and justify our normal form by showing that it ensures the. In some previous work, we defined the Multivalued dependencies and a normal form for XML.

book of multivalued dependencies in XML (called XMVDs) and defined a normal form for a restricted class of XMVDs, called hierarchical XMVDs.

In Multivalued dependencies and a normal form for XML. book paper we define multivalued dependencies in XML (XMVDs). We then propose a normal form for XML documents in the presence of XMVDs and justify our normal form by showing that it ensures the elimination of by:   We define multivalued dependencies in XML (XMVDs) and justify our definition by proving that, for a very general class of mappings from relations to XML, a relation satisfies an MVD if and only if the corresponding XML document Multivalued dependencies and a normal form for XML.

book the corresponding by: A table should have at-least 3 columns for it to have a multi-valued dependency. For a relation R(A,B,C), if there is a multi-valued dependency between, A and B, then B and C should be independent of each other. EmployeeID Technology Hobby.

1 Multivalued dependencies and a normal form for XML. book Cricket. 1 C# Hockey. 2 C# Cricket. 2 SQL Hockey. Multivalued Dependency Tamer Abuelata. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. The relation Multivalued dependencies and a normal form for XML.

book not in 3rd normal form because in BC->D (neither BC is a super key nor D is a prime attribute) and in B->E (neither B is a super key nor E is a prime attribute) but to satisfy 3rd normal for, either LHS of an FD should be super key or RHS should be prime attribute.

So the highest normal form of relation will be 2nd Normal form/5. If a functional dependency X->Y holds true where Y is not a subset of X then this dependency is called non trivial Functional dependency.

An employee table with three attributes: emp_id, emp_name, emp_address. Refer: trivial functional dependency. If a FD X->Y holds true where X intersection Y is null then this dependency is said to be. Nested relations in partitioned normal form (PNF) are an important subclass of nested relations that are useful in many applications.

In this paper we address the question of determining when every PNF relation stored under one nested relation scheme can be transformed into another PNF relation stored under a different nested relation scheme without loss of information, referred to as the two Cited by: 7.

Dependencies and Normal Forms PROPERTIES OF MULTIVALUED DEPENDENCIES We have formalized the property that distinguishes the instances of the rela- tion service in Tables and Let us see how MVDs are related to lossless decomposition. Theorem Let t be a relation on scheme R, and let X, Y, and Z be subsets.

Normal Form for XML Functional Dependencies t 1[X] =t 2[X] ⇒ t 1[Y] = t 2[Y]. Functional dependencies (FDs) Let R be a relation scheme, and X ⊆ R and Y ⊆ R be sets of attributes. Then the functional dependency X → Y holds on R if in any legal relation r, for all pairs of tuples t1 and t2 in r Example: student_id → name.

Note: A transitive dependency can only occur in a relation of three of more attributes. This dependency helps us normalizing the database in 3NF (3 rd Normal Form). Example: Let’s take an example to understand it better: Game of Thrones.

George R. Martin. Dying of the Light. George R. Martin. {Book} -> {Author} (if we know the book, we. XML Support SQL Server Service Broker Business Intelligence Bibliographical Notes PART TEN APPENDICES Appendix A Detailed University Schema A.1 Full Schema A.2 DDL A.3 Sample Data Appendix B Advanced Relational Design (contents online) B.1 Multivalued Dependencies B1 B.3 Domain-Key Normal Form B8.

Database Systems: The Complete Book is ideal for Database Systems and Database Design and Application courses offered at the junior, senior and graduate levels in Computer Science departments. A basic understanding of algebraic expressions and laws, logic, basic data structure, OOP concepts, and programming environments is implied.

The Web Server Environment Database Processing with XML Database Processing for Business Intelligence Systems Step-By-Step • Eliminating Anomalies from Functional Dependencies with BCNF • Eliminating Anomalies from Multivalued Dependencies • Fifth Normal Form • Domain/Key Normal Form Summary E) Fourth Normal Form D) Boyce-Codd Normal Form If a relation is in BCNF, and each multivalued dependency has been moved to a relation of its own, then the first relation is in ________.

Multivalued Dependencies. Attribute Independence and Its Consequent Redundancy. Definition of Multivalued Dependencies. Reasoning About Multivalued Dependencies. Fourth Normal Form. Decomposition into Fourth Normal Form. Relationships Among Normal Forms. Exercises for Section An Algorithm Price: $ Redesign the database of Exercise into first normal form and fourth normal form.

List any functional or multivalued dependencies that you assume. Also list all referential-integrity constraints that should be present in the first- and fourth-normal-form schemas.

Answer: To put the schema into first normal form, we flatten all the attributes. Boyce-Codd Normal Form Multivalued Dependency and Fourth Normal Form Join Dependencies and Fifth Normal Form Summary Review Questions Exercises Laboratory Exercises Selected Bibliography Chapter 16 Relational Database Design Algorithms and Further Dependencies Further Topics.

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

K Morgan Kaufmann Publishers is an imprint of Elsevier. 30 Corporate Drive, SuiteBurlington, MAUSA This book is printed on acid-free paper. Atomic Domains and First Normal Form Decomposition Using Functional Dependencies Functional-Dependency Theory Decomposition Using Functional Dependencies Decomposition Using Multivalued Dependencies More Normal Forms Database-Design Process Modeling Temporal Data Summary 1.

Functional Dependencies 2. Rules about Functional Dependencies 3. Design of Relational Database Schemas 4. Decomposition 5. Third Normal Form 6. Multivalued Dependencies 7.

Algorithmic discovery of multivalued dependencies 4. High Level Database Models 1. Entity / Relationship Models 2. Design Principles 3.

Constraints in the E/R Model 4. Database system concepts. Henry F - Computers - pages. 9 Reviews. From inside the book. What people are saying dependencies hash function Hayes implementation insert Johnson leaf node loan loan-number locking protocol lookup main memory Mianus multivalued dependencies normal form Perryridge branch precedence graph primary key /5(9).

Contribution In this paper we describe a systematic approach to the normalization of XML data when so-called cyclic functional dependencies exist, i.e. dependencies, which in the relational case are functional dependencies of the form {A, B [right arrow] C, C [right arrow] A}, where A, B, C are attributes in a relational schema R(A, B, C).

The concepts of sixth normal form (along with join dependency and trivial join dependency) are clearer now. However, a next question (first of all sorry for taking up your time): Will a table {a,b,c} with join dependencies {(a,b), (b,c)} be in fourth / fifth normal form. The fourth normal form states there should not be more than 1.

Get this from a library. Database system concepts. [Abraham Silberschatz; Henry F Korth; S Sudarshan] -- Presents the fundamental concepts of database management. This text is suitable for a first course in databases at the junior/senior undergraduate level or the first year graduate level.

Inclusion Dependency Normal Form, a normal form combining BCNF with the restriction on the inclusion dependencies that must be non-circular and key-based. Also Date (, ), in the 8th edition of his prominent book, proposes the sixth normal form which he defines for solving temporal issues in database design.

Although seductive toCited by: 5. 53) A form of multivalued dependency is found in _____. A) the multivalued, multicolumn problem B) the inconsistent values problem C) the missing values problem D) the general-purpose remarks column problem E) None of the above is correct.

To be in first normal form (1NF), a relation is not allowed to have any repeating groups, as discussed in Module 7, Page 2. Repeating groups Which of these normal forms involves removing multivalued dependencies.

Removing multivalued dependencies is the major emphasis of achieving fourth normal form (4NF), as discussed in Module 7, Page 4. * A should be prime attribute. First two FDs (i.e. name,courseNo->grade & rollNo,courseNo->grade) satisfies second e name,courseNo & rollNo,courseNo is a superkey.

Last two FDs (i.e name->rollNo & rollNo->name) satisfies third condition because rollNo and name is a prime ore the relation is also in 3NF. Note the definition of BCNF in question number 3.

In this article, we will discuss the normal forms. Normal Forms: Types of Normalization. We organize the data into database tables by using normal forms of rules or conditions. Normal forms help us to make a good database design. Generally, we organize the data up to the third normal form.

We rarely use the fourth and fifth normal form. Fourth and Fifth Normal Forms Multivalued Dependencies Fourth Normal Form Decomposing Tables to 4NF Fifth Normal Form Summary Literature Summary Chapter 7 An Example of Logical Database Design Requirements Specification Design Problems Logical Design 7.

XML Composition vs. First Normal Form. The first normal form in relational theory is so fundamental it's often forgotten. It states that every record in a table must have the same number of fields.

Relational data is rectilinear; a table is a matrix of rows and columns. Modification Anomalies • A Short History of Normal Forms • Normalization Categories From First Normal Form to Boyce-Codd Normal Form Step by Step • • Eliminating Anomalies from Functional Dependencies with BCNF • Eliminating Anomalies from Multivalued Dependencies • Fifth Normal Form • Domain/Key.

Fall CSA Midterm 2 Study Guide Prof Sin Min Lee EXAM Date Thursday October 6 1 Reading ER Model 2 Readings Relational DB SQL 3NF and Boyce-Codd Normal Form.

62 pages. Normal Forms. 23 pages. 4 Normal Form. 26 pages. Normalization_IlhanYoo Multivalued Dependencies. 26 pages. Functional Dependency. 27 pages. RELATIONAL ALGEBRA. Prerequisite – Functional Dependencies The term Armstrong axioms refer to the sound and complete set of inference rules or axioms, introduced by William W.

Armstrong, that is used to test the logical implication of functional F is a set of functional dependencies then the closure of F, denoted as, is the set of all functional dependencies logically implied by F.

Armstrong /5. Fagin, R.: Multivalued dependencies and a new normal form for relational databases. ACM Trans. Database Syst. 2(3), () Google Scholar Digital Library; Galil, Z.: An almost linear-time algorithm for computing a dependency basis in a relational database. ACM 29(1), () Google Scholar Digital Library.

27) Multivalued dependencies create anomalies so serious that multivalued dependencies must always be eliminated. Answer: TRUE 28) Writing SQL subqueries and joins against normalized tables is simple compared to the code that must be written to /5(1).

A table is in sixth normal form (6NF) or Domain-Key normal form (DKNF) pdf it pdf in 5NF and if all constraints and dependencies that should hold on the relation can be enforced simply by enforcing the domain constraints and the key constraints specified on the relation.

Another way of expressing this is.Download pdf example, a table that records data on a book and its author(s) with the following columns: [Book ID], [Author 1], [Author 2], [Author 3] is not in 1NF because [Author 1], [Author 2], and [Author 3] are all repeating the same attribute.

Now first normal form is satisfied, as .Fifth Normal Ebook (5NF) A composite key shouldn't have any cyclic dependencies. Well, this is a highly simplified explanation for Database Normalization.

One can study this process extensively, though. After working with databases for some time, you'll automatically create Normalized databases, as .