relational data model in dbms with example

... Quan hệ SINHVIEN có 5 thuộc tính là MSSV, HOTEN, NGAYSINH, PHAI, DIACHI, MSLOP và 4 bộ dữ liệu. Một dòng dữ liệu còn được gọi là 1 bộ dữ liệu của quan hệ. SINHVIEN(MSSV, HOTEN, NGAYSINH, PHAI, ... Q3Nữ3/4/1982Trần Thanh Vân0112003 CNTT0012 TBT, QINữ2/3/1980Nguyễn Hồng Anh0012002 CNTT00120 THĐ, QINam1/1/1982Trần Vân Anh0012001 MSLOPDIACHIPHAINGAYSINHHOTENMSSV Một ví dụ về quan hệ 4 7 Cho một ... 1 1 CƠ SỞ DỮ LIỆU Chương 3 MÔ HÌNH QUAN HỆ (Relational Data Model) 2 Chương 3 MÔ HÌNH QUAN HỆ I. Một số khái niệm Đònh nghóa quan hệ Khóa của quan hệ

Ngày tải lên: 05/07/2014, 16:20

... DATABASE SYSTEMS RELATIONAL DATA MODEL Spring 2014 Nguyen Ngoc Thien An Contents Overview of Relational Data Model ER- & EER-to-Relational Mapping Relational Algebra ER- & EER-to-Relational ... values in the foreign key  Usually used when the relation containing the foreign key has a high percentage of instances participating in R Option 2:  Drawback: Having an extra... Step 4: Binary ... Boolean type attribute indicating subclasses 𝑆𝑖 (s) of a tuple For overlapping specialization (but also for disjoint specialization) Example Option 8C 51 Example - Option 8D 52 Mapping Shared Subclasses

Ngày tải lên: 16/08/2016, 19:53

... 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, tuple, cardinality ... Relational Data Model 2 Main Phases of Database Design 3 ER-/EER-to-Relational Mapping 3 ER-/EER-to-Relational Mapping 28 Relational Data Model & ER/EER-to-Relational Mapping Trang 29Main Phases ... Constraints -Referential Integrity Relational Data Model & ER/EER-to-Relational Mapping 20 Trang 21Relational Integrity ConstraintsReferential Integrity Statement of the constraint £ The value in

Ngày tải lên: 16/08/2016, 19:53

... 1Chapter 3 Relational Data Model Trang 3Introduction Was first introduced by E F Codd Trang 4• Ingres project at the University of California, Berkeley, 1980s• By many developers, released in 1996 ... associates with a domain - A particular elementary type A component of each tuple - Is atomic corresponding attribute Example - FName: string, DOM(FName): the set of strings - Salary: integer, ... for PK is constrained to be not null - Underline the attributes of PK when displaying its relationschema The choice of PK - Influence some implementation issues - Usually with a single attribute

Ngày tải lên: 30/01/2020, 20:58

... Tran Ngoc Linh Nu Tay Ninh K11 K1105 Tran Minh Long Nam TpHCM K11 K1106 Le Nhat Minh Nam TpHCM K11 Trang 242 Hệ thống tập tin (1) ⚫ Ví dụ 1: SINHVIEN (MASV, HOTEN, NGSINH, GIOITINH, NOISINH, MALOP) ... 222 Hệ thống tập tin (1) ⚫ Ví dụ: Các siêu khóa của quan hệ SINHVIENlà: {MaSV}; {MaSV,Hoten}; {Hoten}; {Noisinh,Hoten}… 3-1-Siêu khóa (super key) SINHVIEN MaSV HoTen Gioitinh Noisinh Malop K1103 ... MALOP) ⚫ Các siêu khóa của quan hệ SINHVIEN là: K={MaSV};{MaSV,Hoten};{Hoten};{Hoten,Gioitinh};{Noisinh,Hoten};{MaSV,Hoten,Gioitinh,Noisinh}  Khóa của quan hệ SINHVIEN có thể là:{MaSV}; {Hoten}

Ngày tải lên: 03/11/2023, 20:53

... hydrodynamic modeling system Singapore Regional Model (Fine and Coarse version) within Delft3D-FLOW is introduced in Chapter 3 Chapter 4 elaborates on the methods utilized in this study, including the ... development Providing hydrodynamic information of the water surrounding Singapore is thus important for accurate scheduling of harbor facilities, docking and sailing times With such intention, Singapore ... carrying out the spatial interpolation in line with its spatial dependence structure Hence, figuring out the spatial dependence structure becomes an indispensible component in many hydrological modeling

Ngày tải lên: 09/09/2015, 17:56

... XMark Instead of storing the entire data as a single, large XML instance, it is more natural in a relational database to store the data in tables representing the different entities in the data model ... /site/open_auctions/open_auction/bidder (ignoring the ordinal [1]), an index seek into the PROPERTY index finds the first bidder node within the XML instance A back join with the primary XML index on the (ID, ORDPATH) ... relational framework for query processing 1 Introduction Introducing XML [3] support in relational databases has been of keen interest in the industry in the past few years One solution is to

Ngày tải lên: 07/03/2014, 14:20

... in line crosses using flanking... together In addition to removing insignificant effects of QTL (whether main or epistatic) from the model and to retaining the appropriate mixing behavior, ... complete sampling outline is as follows: (a) updating µ using the Gibbs sampler; (b) updating l or m using the RJMCMC algorithm; (c) updating θ using the MH algorithm; (d) updating δ and γ using the ... method is able to take into account QTL that are segregating within each breed and a large number of polygenes with minute and individually undetectable effects In this... crops and

Ngày tải lên: 14/08/2014, 13:22

... storing binary data in plain text and reducing file size using compression The standard approach to representing binary data in XML is with the use of base64 encoding A 24-digit base 2 binary ... relationships included in an imaging experiment The OME Data Model integrates binary image data and all information regarding the image acquisition and processing, and any results generated during analysis ... transactions with the data warehouse, including all data transformations and analyses Storing and recording image data is a first step; a defined set of interfaces and access methods to the data must

Ngày tải lên: 14/08/2014, 14:21

... areas Studying blood flow in arteries and veins has many direct applications in medicine, including hypertension and atherosclerosis These conditions may both develop in patients with diabetes ... administered in some vein As an example, take the target area to be some region in the brain Using our time-dependent Taylor diffusion equation and supposing one has a complete circulatory model, ... 18Comparison of Pressure with and without Womersley Profiles Velocity profiles at various locations in the arterial tree simulated using Womersley model combined with 1D model Comparison of flow

Ngày tải lên: 13/11/2014, 10:12

... on a Standard Linear Solid material model, using a linear viscoelastic (LVE) constitutive model The LVE model was obtained by setting the proportionality coefficient 6 to zero in the free volume ... model associated with a linear viscoelastic (LVE) model was investigated Linear viscoelasticity was implemented in the finite element code by setting the coefficient 6 to zero in the free volume ... subtracting the free dashpot asymptotic line from the PVAc creep curve in order to obtain the shear creep function J(t) of a cross-linked polymer, the final material (see Fig 2.2) In order to input

Ngày tải lên: 29/11/2014, 07:00

... Sorting 463 15.4 Exchange Sorting 468 15.5 Selection Sorting 479 15.6 Merge Sorting 487 15.7 A Lower Bound on Sorting 492 15.8 Distribution Sorting 493 15.9 Performance Data ... deals with abstraction and data types It presents the recurring design patterns used throughout the text as well a unifying framework for the data structures presented in the subsequent chapters In ... implementations, including binary heaps, leftist heaps, and binomial queues In particular this chapter illustrates how a more complicated data structure (leftist heap) extends an existing one (tree)

Ngày tải lên: 13/02/2015, 11:26

... competing data flows We build the constraints based on the protocol model [4] of packet transmission According to the protocol model, all links originating from node k will interfere with link (i, ... total outgoing data flows must equal to the sum of the total incoming data flows and the non-negative data collection rate R i Since the sensor nodes relay all incoming data flows, only the sink nodes ... traditional wireline networks In sensor networks, the capacity of a wireless link is interrelated with other wireless links in its cluster Therefore, data flows compete for the capacity of individual

Ngày tải lên: 14/04/2015, 14:22

... original philosophy behind data mining is the attempt to circumvent the numerical models Data mining has become an... numerical models and observed data, a method referred to as data ... uniform distribution with zero mean and specified variance.  Presentations of Training Examples. Present the network with an epoch of training examples. For each training example, perform the ... models could be diminished due to certain inherent delimiting factors, such as simplifying assumptions employed in the numerical models, errors in the numerical schemes, inaccuracy in

Ngày tải lên: 11/09/2015, 10:15

... stages involved  designing the form,  deploying the Form on the server,  deploying the form on the device,  collecting data, sending data to the server and server and analyzing the data ... employment not sustainable  Data delays and data obsolete yet wanted real time data for planning at that level  lack of integration of the data - In 2011, the growing use of mobile phones ...  Administration Module : for data management , data reports, data exportation, data visualization Trang 8Data collection & Extraction  Testing : 3 Districts (Urban/Rural)  Training :

Ngày tải lên: 05/12/2016, 17:14

... 170 6.1 Effect of training dataset size on speech recognition [24] 183 6.2 Trends in miss rate across training database size 190 6.3 Trends in FA/kw rate across training database size 190 ... spotting gies to two data mining tasks: real-time keyword monitoring and large audiodocument database indexing With the ever-increasing amounts of audio andmultimedia being generated daily, the ... Engineering ResearchACOUSTIC KEYWORD SPOTTING IN SPEECH WITH APPLICATIONS AT QUEENSLAND UNIVERSITY OF TECHNOLOGY BRISBANE, QUEENSLAND 9 MARCH 2005 Trang 3Keyword Spotting, Wordspotting, Data Mining,

Ngày tải lên: 07/08/2017, 11:32

... some interesting findings The external return to education is only Page | 44 significant for female living with husband and studying in public school For individual living with husband/wife, an increase ... recommendations This chapter includes three parts, including main findings, recommendations, and limitations While the main findings section helps to summarize the results of paper in aiming estimate the ... provinces/cities with GDP higher than average and 0.189 – 0.008*Educated for individual living in province/cites with GDP lower than average When married individual living in the province/city with high

Ngày tải lên: 03/01/2019, 00:09

... floating data of cluster members before sending the floating data to the base station In particular, the cluster head can avoid sending the useless data of a vehicle with the unchanged heading ... set of all links Because the cyclists have a common cycling path, G is divided into a number of long-thin groups that can be sorted in order with its low-tier links During the sensing data collection ... Reordering: How should the transmission order of members for sensing data collection be determined with the aim of minimizing packet collision probabilities in the low-tier network? 4 Data Aggregating:

Ngày tải lên: 20/01/2019, 06:46

... code Figure 4 A generalized model training workflow for Azure ML models Key points on the model training workflow: Data input can come from a variety of interfaces, including web services,HTTP connections, ... of an issue than having an insufficient inventory Keep this fact in mind as we are evaluating models For this example, we’ll use a dataset containing a time series of demand information for the ... using Python in Azure ML can be found in the documentation Trang 19Azure ML WorkflowsModel training workflow Figure 4 shows a generalized workflow for training, scoring, and evaluating amachine

Ngày tải lên: 04/03/2019, 13:38

... Attribute/Domain Row Tuple Values in a column Domain Table Definition Schema of a Relation Populated Table Extension The Relational Data Model and Relational Database Constraints

Ngày tải lên: 12/05/2014, 11:55