4 relational data model section 2

... Outline  Relational Model Concepts  Relational Model Constraints and Relational Database Schemas  Update Operations and Dealing with Constraint Violations Relational 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...

Ngày tải lên: 12/05/2014, 11:55

... 20 10 Chương MÔ HÌNH QUAN HỆ II Chuyển mô hình ER sang mô hình quan hệ Bước Thuộc tính đa trò MAPB TENPB DIADIEM PHONGBAN DIADIEM_PHG (MAPB, DIADIEM) 21 Chương MÔ HÌNH QUAN HỆ II Chuyển mô hình ... = 1,m Chương MÔ HÌNH QUAN HỆ ĐỊNH NGHĨA QUAN HỆ • Lược đồ quan hệ (relation scheme) R(A1, A2, , An): – Trong R tên lược đồ quan hệ – A1, A2, …, An thuộc tính l...

Ngày tải lên: 05/07/2014, 16:20

... actions that define the relationship between each pair of entities, and label the line with the relationship verb This is the initial ER diagram for the logical data model Answer in v04_160 9a_ act42-1.bmp ... v04_160 9a_ act42-1.bmp Activity 4.2: Creating a Logical Data Model Exercise 2: Determining Cardinality and Existence In this exercise, you will use the syntax discu...

Ngày tải lên: 21/12/2013, 06:16

... 74 Activity 9.4: Identifying Data Access Requirements Exercise 1: Identifying a Data Access Method for a Scenario (10 minutes) ! Identify data access requirements Participate ... generated and copies to be stored in a repository for easy access in the future Solution A B Activity 9.4: Identifying Data Access Requirements 75 Exercise 2: Analyzing Technolog...

Ngày tải lên: 21/12/2013, 06:16

... include: • Scaling the MSF Team Model • Applying the MSF Team Model v vi Module 4: MSF Team Model Background on Scaling the MSF Team Model Scaling for Small Projects Although the Team Model consists ... successful team, and the MSF Team Model Team Goals for Success The MSF Team Model Principles of a Successful Team Scaling the MSF Team Mod...

Ngày tải lên: 24/01/2014, 10:20

... implementations differ, NoSQL database management systems share a common set of characteristics: • No schema required Data can be inserted in a NoSQL database without first defining a rigid database schema ... necessity, forced to invent new approaches to data management These NoSQL or non-relational database technologies are a better match for the needs of modern int...

Ngày tải lên: 19/02/2014, 12:20

... concise way to formulate certain types of queries for multi-level annotated corpora Queries are automatically converted into the underlying query language and then executed A query in simplified ... associated query language NXT Search (Heid et al., 2004) is a powerful declarative language for querying diverse relations (incl pointers), supporting quantification and constructs...

Ngày tải lên: 08/03/2014, 04:22

... de-facto standard representation format for annotated text corpora While the XML standard specifies a data model and serialization format for XML, a semantics is largely left to be defined for a particular ... annotation data from the base data and introduces references from the annotations to the base data, thus allowing to keep multiple layers of annotations on the same...

Ngày tải lên: 17/03/2014, 04:20

... presents the data model Section describes the attribute type system Section describes how the query language can be extended with user-defined procedures Section compares the model with other data models ... is to move the computation that constructs the mainmemory data structure to the database process Suppose the procedure MakeForm built the data structure given...

Ngày tải lên: 28/04/2014, 13:32

... Knowledge Byte In this section, you will learn about: Creating partitioned indexes System-defined stored procedures Creating Partitioned Indexes Read the following topic in the section Creating and ... task determines the boundary values for creating partitions? a Creating a partition function b Creating a partition scheme c Creating a clustered index d Creatin...

Ngày tải lên: 31/07/2014, 15:20

... directly use and adapt XGAP as a platform for their particular experimental data and analysis protocols We successfully evaluated the XGAP model and software in a broad range of experiments: array data ... MOLGENIS language and the generator automatically changes XGAP database software to your research Upload Upload data from measurement devices, public databases,...

Ngày tải lên: 09/08/2014, 20:21

... management and analysis system for biological microscopy The data model used by OME is represented in two distinct ways: a set of open- source software tools that use a relational database for information ... written for XML, including databases, editing tools, and parsing libraries Finally, and perhaps most important, XML is a plain-text format As a last resort...

Ngày tải lên: 14/08/2014, 14:21

... Categories of© relational 1995, 2005 DML Introduction Relational algebra and relational calculus are formal languages associated with the relational model Informally, relational algebra is a (highlevel) ... Meaning of the term relational completeness How to form queries in relational algebra How to form queries in tuple relational calculus How to form queries in do...

Ngày tải lên: 21/10/2014, 23:08

... Trang: Báo cáo chuyên đề sở liệu nâng cao Đây mô hình tương tác client với database thông quan network data model II Các thành phần network data model Việc sử dụng data network model để quản lý liệu ... Báo cáo chuyên đề sở liệu nâng cao Trang kết tìm kiếm Trang thêm bạn HVTH: Nguyễn Ngọc Diễm Trang: 32 Báo cáo chuyên đề sở liệu...

Ngày tải lên: 11/04/2015, 07:57