TREATMENT OF DEPENDENCIES

Aug 06, 2012

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IAEA.PNRA.05.05. Stetkar

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TREATMENT OF DEPENDENCIES

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1. IAEA.PNRA.05.05 Stetkar & Associates 1 TREATMENT OF DEPENDENCIES by John W. Stetkar Presented to National Training Course on Probabilistic Safety Assessment Islamabad, Pakistan May 2 - 6, 2005 IAEA Project C7-PAK/9/028-001

2. IAEA.PNRA.05.05 Stetkar & Associates 2

Multivalued Dependencies

Multivalued Dependencies. Fourth Normal Form. Source: Slides by Jeffrey Ullman. Definition of MVD.

476 views • 18 slides

Functional Dependencies

Functional Dependencies. Definition: If two tuples agree on the attributes . A , A , … A . 1. 2. n. then they must also agree on the attributes. B , B , … B . 1. 2. m. Formally:. A , A , … A . B , B , … B . 1. 2. m. 1. 2. n.

371 views • 22 slides

Functional Dependencies

Functional Dependencies. Why FD's Meaning of FD’s Keys and Superkeys Inferring FD’s. Source: slides by Jeffrey Ullman. Improving Relation Schemas. Set of relation schemas obtained by translating from an E/R diagram might need improvement

453 views • 36 slides

Functional Dependencies

Functional Dependencies. Outline. Functional dependencies (3.4) Rules about FDs (3.5) Design of a Relational schema (3.6). name. buys. Person. Product. price. name. ssn. Relational Schema Design. Conceptual Model:. Relational Model: plus FD’s. Normalization: Eliminates anomalies.

509 views • 36 slides

Functional Dependencies

Functional Dependencies. Functional Dependencies. An example:. loan-info=. Observe: tuples with the same value for lno will always have the same value for amt We write: lno  amt (lno “ determines ” amt, or

577 views • 45 slides

Functional Dependencies

Functional Dependencies. Chapter 15.1-15.2, 15.5 (6/E) Chapter 10.1-10.2, 10.5 (5/E). Lecture Outline. Design guidelines for relation schemas Functional dependencies Definition and interpretation Formal definition of keys Boyce- Codd Normal Form (BCNF)

299 views • 10 slides

Data Dependencies

Data Dependencies Describes the normal situation that the data that instructions use depend upon the data created by other instructions, or data is stored in locations used by other instructions. Three types of data dependency between instructions, True data dependency Antidependency

909 views • 30 slides

Functional Dependencies

Functional Dependencies. Er . Dharmesh Dubey. Consider the FD set below: F={A->B, C->X, BX->Z} Prove that AC->Z CB->Z AC->Z Proved. (C->X and BX->Z, Pseudo Transitivity). (A->B and CB->Z, Pseudo Transitivity). Consider the FD set below: F={A->B, BC->D}

313 views • 16 slides

Functional Dependencies

Functional Dependencies. Quiz. Project Relation Attributes. project name – pname start date – start budget customer name – cname customer phone – cphone customer email – cemail employee SIN – sin employee first name – fname employee last name – lname

268 views • 14 slides

Multivalued Dependencies

Multivalued Dependencies. by Asmerom Tekeste. Normal Forms. BCNF. 5NF. 2NF. 4NF. 3NF. 1NF. Functional dependencies. Multivalued dependencies. Join dependencies. Recall Normal Forms. Example :. R (A, B, C, D, E). FD: { B, C, D, E}. A. Normal Form of R (A,B,C,D,E).

530 views • 13 slides

Functional Dependencies

Functional Dependencies. Functional Dependencies. Using FD ’ s to determine global IC ’ s: Step 1: Given schema R = {A1, ..., An} use key constraints, laws of physics, trial-and-error, etc ... to determine an initial FD set, F.

515 views • 35 slides

Multivalued Dependencies

Multivalued Dependencies. Fourth Normal Form Reasoning About FD’s + MVD’s. Definition of MVD.

402 views • 30 slides

Dependencies

Dependencies. Subversion - http://subversion.tigris.org/ Subclipse - http://subclipse.tigris.org/ Maven 2 - http://maven.apache.org/ Mevenide - http://mevenide.codehaus.org/ Tomcat 5.5 - http://tomcat.apache.org/ HSQL 1.8 - http://hsqldb.org/. Deployment. portlet.xml. Domain Objects.

182 views • 5 slides

Co-Dependencies of Concepts

Co-Dependencies of Concepts. What Does It Mean?. What Does It Mean?. Service-Orientation Principles. Reuse Blocks of logic, mutually sought by many Statelessness Should not be required to manage the state of interactions Sessions; users “statefulness”  tight coupling Loose coupling

998 views • 90 slides

Functional Dependencies

Functional Dependencies. R&G Chapter 19. Review: Database Design. Requirements Analysis user needs; what must database do? Conceptual Design high level descr (often done w/ER model) Logical Design translate ER into DBMS data model Schema Refinement consistency,normalization

278 views • 16 slides

MULTIVALUED DEPENDENCIES

MULTIVALUED DEPENDENCIES. Ha Do. Functional Dependency. a. 4. b. Q. c. $. Domain (X). Range (Y). Recall that if X uniquely determines Y, then Y is functionally dependent on X.

304 views • 14 slides

Functional Dependencies

Functional Dependencies. Motivation. E/R  Relational translation problems : Often discover more “detailed” constraints after translation (upcoming example) Some relationships not easily captured in E/R diagrams: for a particular star and movie, there is exactly one studio:

222 views • 10 slides

Functional Dependencies

Functional Dependencies. Babies. At a birth, there is one baby (twins would be represented by two births), one mother, any number of nurses, and a doctor. Suppose, therefore, that we have a table: Births(baby, mother, nurse, doctor) Some facts and assumptions

365 views • 34 slides

Multivalued Dependencies

Multivalued Dependencies. Fourth Normal Form. A New Form of Redundancy. Multivalued dependencies (MVD’s) express a condition among tuples of a relation that exists when the relation is trying to represent more than one many-many relationship.

212 views • 19 slides

Managing Dependencies

Managing Dependencies. Objectives. After completing this lesson, you should be able to do the following: Track procedural dependencies Predict the effect of changing a database object on stored procedures and functions Manage procedural dependencies. Understanding Dependencies.

363 views • 32 slides

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