basic concepts of relational data model

... principle of virtual work 228 c Proof of the weak theorem of virtual work 229 A2 Strong principle of virtual work 232 a Virtually migrating control volumes 232 b Forces Strong principle of ... work, a meansof capturing the kinematics associated with the transfer of material is needed Iaccomplish this with the aid of three notions, none of which is a standard Thefirst, that of material ... volumes 232 b Forces Strong principle of virtual work 233 c Proof of the strong theorem of virtual work 234 d Comparison of the strong and weak principles 236 Trang 13consistent with

Ngày tải lên: 24/04/2014, 16:48

... Trang 1The Relational Data Model and Relational Database ConstraintsTrang 2Chapter Outline Relational Model Concepts  Relational Model Constraints and Relational Database Schemas  ... Trang 3Relational Model Concepts The relational Model of Data is based on the concept of a Relation.  A Relation is a mathematical concept based on the ideas of sets.  The strength of the relational ... approach to data management comes from the formal foundation provided by the theory of relations.  We review the essentials of the relational approach in this chapter. Trang 4Relational Model Concepts

Ngày tải lên: 12/05/2014, 11:55

... speculation of the wool rubbing something off of the wax, the type of charge that was associated with rubbed wax became known as "negative" (because it was supposed to have a deficiency of fluid) ... change the type of atom that it is In fact, if you could remove three protons from the nucleus of an atom of lead, you will have achieved the old alchemists' dream of producing an atom of gold! The ... attracting or repelling depending on the types of charges involved The operational definition of a coulomb as the unit of electrical charge (in terms of force generated between point charges) was

Ngày tải lên: 09/08/2014, 13:21

... Trang 1DATABASE SYSTEMS Nguyen Ngoc Thien An RELATIONAL DATA MODEL Spring 2014 Trang 2Contents 2 Overview of Relational Data Model ER- & EER-to-Relational Mapping Relational Algebra ... Types (Categories) Trang 5ERD of Company Database Start_date Hours Name Number Location Name Sex Birth_date Relationship Trang 66 Relational Schema of Company Database Fname Minit Lname SSN ... Attributes of S  The primary key attribute(s) of the relation(s) corresponding to Ei(s)  Foreign key attribute(s) of S  This takes care of mapping the identifying relationship type of W  The

Ngày tải lên: 16/08/2016, 19:53

... ER-/EER-to-Relational Mapping 3 ER-/EER-to-Relational Mapping 2 Relational Data Model & ER/EER-to-Relational Mapping Trang 3Relational Data Model£ Basic Concepts: relational data model, relation schema, domain, ... Communications of the ACM, June 1970 Relational Data Model & ER/EER-to-Relational Mapping 4 Trang 5Basic Concepts£ Relational data model: represents a database in the form of relations - ... as t[Ai] Relational Data Model & ER/EER-to-Relational Mapping 8 Trang 9Basic ConceptsRelational data model Database schema Relation schema Relation Tuple Attribute Trang 10Basic Concepts£

Ngày tải lên: 16/08/2016, 19:53

... normal operations of a business • Wages payable Trang 48Examples of PayablesTrang 49Sales of Inventory • Sales of inventory contain both revenue and expense components Trang 50Sales of Inventory • ... result of past transactions or events. Trang 6Liabilities • Liabilities are present obligations of the firm – They are probable future sacrifices of economic benefits which arise as the result of ... Trang 1Basic Concepts of Financial AccountingChapter 2 Trang 2The Basic Accounting Equation • Financial accounting is based upon the

Ngày tải lên: 05/12/2016, 17:28

... unpredictable due to this type of uncertainty This is often referred to as lack of causality in quantum measurements squeezing The most profound and fundamental postulate of the quantum theory probably ... probabilityof measurement results The standard quantum theory describes a following ensemble measurement: 1 Preparation of an ensemble of identical systems 2 Noise-free measurement of a specific ... must know not only the influence of the un-known force on the quantum system but also the influence of the coupling of the quantum probe and the measurement of the probe observable on the quantum

Ngày tải lên: 01/10/2018, 05:58

... simplex of K is a face of some w-simplex of K (b) Each (n — l)-simplex is a face of exactly two «-simplexes of K (c) Given a pair o\ and o\ of «-simplexes of K, there is a sequence of n-simplexes ... follows for chains of length one and We think of this intuitively as indicating that the union of the members of c p forms the point-set boundary of the union of the members of c p + 1 For example, ... empty set 155 set of all x such t h a t 155 union of sets 155 intersection of sets 155 closure of a set 158 complement of a set 155 product of sets 155, 157 absolute value of a real or complex

Ngày tải lên: 14/12/2018, 09:48

... unpredictable due to this type of uncertainty This is often referred to as lack of causality in quantum measurements squeezing The most profound and fundamental postulate of the quantum theory probably ... probabilityof measurement results The standard quantum theory describes a following ensemble measurement: 1 Preparation of an ensemble of identical systems 2 Noise-free measurement of a specific ... must know not only the influence of the un-known force on the quantum system but also the influence of the coupling of the quantum probe and the measurement of the probe observable on the quantum

Ngày tải lên: 02/08/2019, 20:22

... Any software structure that can be used by the process to advance its execution  Ex: data structure, a set of variables, main memory area, a file, a piece of program, a set of registers of a ... according to a set of specified constraints  Schedulable set of tasks  A set of tasks that has at least one feasible schedule by some scheduling algorithm Trang 9Example of preemptive scheduleTrang ... resource An example of mutual exclusion Trang 24Wait on busy resourceTrang 25Definition of scheduling problemsTrang 26NLT, SoICT, 2015Complexity of scheduling algorithm  Complexity of scheduling decision

Ngày tải lên: 30/01/2020, 01:18

... 15Characteristics of relation Each value of components in a tuple - Atomic or - NULL Relations are sets of tuples, not lists of tuples - There are no identical tuples Trang 16Relational model notation ... SALARY:DOM(INTEGER), DNO:DOM(INTEGER)) The degree of a relation is the number of attributes of its relation schema Trang 17Relational model notation • Each vj is a member of DOM(Aj) or NULL value FNAME LNAME ... way to represent data - The relation: a two-dimensional table The theoretical background - Set theory of mathematical logic Trang 7Relational model presents the DB as a collection ofrelations -

Ngày tải lên: 30/01/2020, 20:58

... linear overlap of sp2 of C with 1s of H 2 C–C,  bond is formed by the linear overlap of sp2 of one C with that of the other 3 C–C,  bond is formed by sidewise overlapping of 2pz orbitals ... the 1s orbital of H 2 C–O  bond: It is formed by the linear overlapping of sp3 of C with sp3 of O atom 3 O–H  bond: It is formed by the linear overlapping of sp3 of O with 1s of H The two ... formed by the linear overlap of sp hybrid orbital of one carbon with that of the other 2 C–H,  bonds (two): They are formed by the linear overlap of sp hybrid of C with 1s of H 3 C–C, π bonds: The

Ngày tải lên: 02/08/2021, 14:55

... principle 3 period of an element Atomicity and elements of the periodic table 8 Some records of periodic table 30 Molecular Structure Different types of chemical bonds 33 Cations of stable electron ... 52 Shape and symmetry of molecular orbitals 78 Diatomics of the first period elements 80 Homonuclear Diatomics of Second Period Strength of hydroxide bases 115 Hard and soft acids and bases 118 ... of elements 201 Isolation of metal from concentrated ore 207 Thermal (or chemical reduction) 208 Electrolytic method of reduction 209 Displacement of one metal by the other 209 Purification of

Ngày tải lên: 16/09/2021, 22:44

... Trang 1Basic Concepts Of Information Technology (IT) Dheeraj Mehrotra www.computerscienceexpertise.com Trang 2The Basics – What is Information?• Information is data processed for ... ‘Black Box’ model Trang 8Processing - the ‘Black Box’ modelz We can think of a computer as a ‘black box’ : 3+5 8 Trang 9Components of a Computer Systemz Computer Systems are made up of: z Hardware ... 21z Generic name of all programs z Made up of code interpreted by the hardware z Written in programming languages - Java, C, C++, Perl z Two kinds of Software: Trang 22System Softwarez Concerned

Ngày tải lên: 15/10/2021, 11:06

... necessity of rejecting a number of concepts of classical physics The second chapter deals with the physical concepts of quantum mechanics The chapter starts with an analysis Trang 14of a set of basic ... conservation of energy is a consequence of homoge-neity of time. (independence of the course of a physical process of the moment chosen as the starting point of the process); the law of conservation of ... analysis of the manuscript He is also grateful to Prof Yu A Vdovin, Prof E E Lovetsky, Prof G F Druka-rev, Prof V A Dyakov, Prof Yu N Pchelnikov, and Dr A M Polyakov, all of whom took the trouble of

Ngày tải lên: 30/05/2022, 12:04

... Trang 1BASIC CONCEPTS OF ORGANIZATIONAL CHANGEFOR ADMINISTRATIVE LEADERS Trang 2The Magnitude of Change The disruptive impact of major change on colleges and universities ... established frames of reference, Trang 4accepted patterns of behavior and old methods of operation are invalidated Unfreezing invalidates established frames of reference and accepted patterns of behavior ... Process The model of change described above depicts a set of stages that imply a kind of orderly chronological progression In reality, organizations are constantly bombarded by various kinds of unfreezing

Ngày tải lên: 20/10/2022, 22:53

... Trang 1Tp.HCM, năm 2023TRƯỜNG ĐẠI HỌC QUỐC TẾ SÀI GÒN BỘ GIÁO DỤC VÀ ĐÀO TẠO RELATIONAL DATA MODEL CHƯƠNG 2 Trang 2Giới thiệuMột số khái niệm cơ bản Ràng buộc toàn vẹn Các đặc trưng ... Trang 461 Elmasri, Navathe Fundamentals of Database Systems Addison-Wesley Sixth Edition 2011. 2 Hector Garcia-Molina, Jeffrey D Ullman, and Jennifer Widom, Database Systems - The Complete Book,

Ngày tải lên: 03/11/2023, 20:53

... 1CHAPTER 2 BASIC CONCEPTS OF INFORMATION TECHNOLOGYHO CHI MINH CITY UNIVERSITY OF TRANSPORT FACULTY OF INFORMATION TECHNOLOGY SOFTWARE ENGINEERING DEPARTMENT Trang 31 Data and Information• The Data ... representation of data or information; • 1 byte = 8 bits • A byte contains enough information to store a single character Trang 23Basic Units of MeasurementBasic Units of Measurement Trang 24Basic Units of ... hierarchy Trang 4Data-Data and Information• Data is the raw, unprocessed facts, including text, numbers, images, and sounds • Information is a collection of processed data from a variety of sources

Ngày tải lên: 03/01/2024, 14:10

... number and placement of electrons B) number of electrons only C) placement of atoms only D) number of atoms only E) placement of electrons only 32) The oxidation number of phosphorus in PF3 is ... E) all of the above 4) Which of the following does not have eight valence electrons? A) Ca+ B) Rb+ C) Xe D) Br− E) All of the above have eight valence electrons 5) The chloride of which of the ... the sum of ionization energies of the components in an ionic solid E) the sum of electron affinities of the components in an ionic solid 7) In ionic bond formation, the lattice energy of ions

Ngày tải lên: 13/04/2025, 18:44

... Income Cheat No Married 80K ? 10 Test Data Start from the root of tree. © Tan,Steinbach, Kumar Introduction to Data Mining 11 Apply Model to Test Data Refund MarSt TaxInc YES NO NO NO Yes ... Tan,Steinbach, Kumar Introduction to Data Mining 3 Illustrating Classification Task © Tan,Steinbach, Kumar Introduction to Data Mining 13 Apply Model to Test Data Refund MarSt TaxInc YES NO NO NO Yes ... Attributes Training Data Model: Decision Tree © Tan,Steinbach, Kumar Introduction to Data Mining 8 Decision Tree Classification Task Decision Tree © Tan,Steinbach, Kumar Introduction to Data Mining...

Ngày tải lên: 15/03/2014, 09:20