Lecture Database management systems Chapter 2 Entity relationship model

... know that an instance of a 'technical document' can have a title and subject Database management systems - Using a database for document retrieval - page 10 Metadata search We can implement an indexed ... Integration with applications and workflow systems Database management systems - Using a database for document retrieval - page 13 Information portals...

Ngày tải lên: 31/03/2014, 20:20

... by attaching a 100 Chapter sno pno s1 s1 s1 s1 s2 s2 s3 s4 s4 A p1 p2 p3 p4 p1 p2 p2 p2 p4 B1 pno A/B1 p2 B2 s1 s2 s3 s4 pno p2 p4 A/B2 B3 pno p1 p2 p4 sno sno s1 s4 A/B3 sno s1 Figure 4.14 Examples ... domain is inherited (sid) 22 22 31 31 58 58 sname Dustin Dustin Lubber Lubber Rusty Rusty rating 7 8 10 10 age 45.0 45.0 55.5 55.5 35.0 35.0 Figure 4.11 (sid) 22 58 22 58 22 58 bid 101 10...

Ngày tải lên: 08/08/2014, 18:22

... 10 20 — 2 9, 3, 10 16 21 21 25 21 36 66 28 70 90 15 20 24 24 27 35 65 69 37 89 94 16 86 53 57 21 36 66 60 70 90 15 20 89 56 59 35 65 69 69 89 94 0 65 32 32 0 32 0 60 Preparing for the Project Management ... 5.00 0 .25 00 0.1111 15.17 29 .50 4.00 0 .25 00 2. 2500 0.0000 20 23 20 20 .50 0.50 5.00 0.00 0 .25 00 0.0000 20 .50 5.00 0 .25 00 0.0000 94.00 3.1111 1.763834...

Ngày tải lên: 24/10/2013, 15:15

Ngày tải lên: 26/01/2014, 07:20

... used to manipulate relational databases The Relational Database Concept • Proposed by Dr Codd in 1970 • The basis for the relational database management system (RDBMS) • The relational model contains ... defined and established in an ad-hoc manner ~ Croswell, 1991 Relational Database Management System - a database system made up of files with data elements in two-dimen...

Ngày tải lên: 17/03/2014, 00:20

... everything in the database Database management systems - Using a database for document management - page Using a database for management There are advantages to using systems that manage both document ... same database System Document Meta Data Document Documents Database Using a database for management It is often easier to create a syste...

Ngày tải lên: 31/03/2014, 20:20

... by the two main types of databases: textual and relational Database management systems - Textual, relational and xml databases – page Flat file databases The flat file database can be considered ... following types of database can meet your needs? A relational database A textual database Please click on the answer of your choice Database management systems -...

Ngày tải lên: 31/03/2014, 20:20

... with a relational database SQL is more than simply a query language; it is a database sub-language and is becoming the standard interface to relational and non -relational database management systems ... packages, SQL/ DS and DB2, on this language SQL was adopted as an industry standard in 1986 (SQL- 86) Since then there has been three more standards, SQL- 89, SQL2...

Ngày tải lên: 31/03/2014, 20:20

... Objectives At the end of this lesson, you will: • understand the functionalities offered by CDS/ISIS, a textual DBMS; • understand the technical work needed by developers to implement these functionalities; ... understanding of the concepts covered in this lesson Good luck! Exercise What is CDS/ISIS? A set of tools for relational database management A textual...

Ngày tải lên: 31/03/2014, 20:20

... System Support for Software Fault Tolerance in Highly Available Database Management Systems by Mark Paul Sullivan Abstract Today, software errors are the leading cause of outages in fault ... differences in the risk to data in main CHAPTER INTRODUCTION memory and on disk 1.3 Existing Approaches to Software Fault Tolerance Current strategies for reduci...

Ngày tải lên: 28/04/2014, 13:32

... metamizole (formylaminoantipyridine and aminoantipyridine), and two micobiological metabolites (1,5-dimethyl-1 , 2- dehydro-3-pyrazolone, 4-( 2- methylethyl )-1 ,5dimethyl-1 , 2- dehydro-3-pyrazole) were studied ... techniques, being to 10 ng/L in drinking water and surface water and 50 ng/L in wastewater.48 The authors recommended the use of LC-(+)ESI-MS/MS for th...

Ngày tải lên: 18/06/2014, 16:20

... one person, the draft’s drawer, to another person, its drawee, to make a payment paying either to the drawer or to a third person, the payee of the draft A check, the most common form of draft in ... For the holder of the banker’s acceptance, the risk is the bank’s credit Historically, if the drawer of a bill of exchange did not have a good or known credit ratin...

Ngày tải lên: 02/07/2014, 16:21

... 1999 Chỉ quan hệ “là-một” (“is-a”) thực thể Khái quát hóa: Mỗi thể thực thể thể thực thể cha Mỗi đặc tính thực thể cha (thuộc tính, khóa xác định, quan hệ khái quát hóa khác) đặc tính thực thể 20 ... mềm Mô hình quan hệ thực thể Lược đồ quan hệ - thực thể (Entity- Relationship Schema) Mô tả yêu cầu liệu cho hệ thống thông tin Dùng ký...

Ngày tải lên: 09/07/2014, 07:20