7 Chapter Database ① Introduction of the Database ② The Classification of Database

Section 1 Introduction of the Database 01 The Concept of the Database A database is often abbreviated DB. A database is a collection of information organized in such a way that a computer program can quickly select desired pieces of data. You can think of a database as an electronic filing system. (1/2)

Section 1 Introduction of the Database 01 The Concept of the Database Traditional databases are organized by fields, records, and files. A field is a single piece of information; a record is one complete set of fields; and a file is a collection of records. For example, a telephone book is analogous to a file. It contains a list of records, each of which consists of three fields: name, address, and telephone number. (2/2)

Section 1 Introduction of the Database 01 The Concept of the Database

Section 1 참고 데이터베이스 (database) 데이터베이스란 여러 사람에 의해 공유되어 사용될 목적으로 통합 관리되는 정보의 집합이다. 논리적으로 연관된 하나 이상의 자료 모음으로 그 내용을 고도로 구조화함으로써 검색과 갱신의 효율화를 꾀한 것이다. 즉, 몇 개의 자료 파일을 조직적으로 통합하여 자료 항목의 중복을 없애고 자료를 구조화하여 기억시켜 놓은 자료의 집합체이다. (1/2) Introduction of the Database

Section 1 참고 이 용어가 처음 사용된 것은 1963 년 6 월 미국 SDC(System Development Corporation) 가 산타모니카에서 개최한 ‘ 컴퓨터 중심의 데이터베이스 개발과 관리 ’ 라는 심포지엄에서이다. 이 심포지엄에서 발표된 많은 논문들은 대부분 데이터 파일에서 정보를 쉽게 검색하는 작업에 관련된 것들이었으며, 데이터베이스는 단순히 자기 테이프와 같은 보조 기억 장치에 저장된 자료 파일의 의미로 쓰였다. (2/2) Introduction of the Database

Section 1 02 The Hypertext Database and DBMS An alternative concept in database design is known as Hypertext. In a Hypertext database, any object, whether it be a piece of text, a picture, or a film, can be linked to any other object. Hypertext databases are particularly useful for organizing large amounts of disparate information, but they are not designed for numerical analysis. (1/2) Introduction of the Database

Section 1 02 The Hypertext Database and DBMS To access information from a database, you need a database management system (DBMS). This is a collection of programs that enables you to enter, organize, and select data in a database. (2/2) Introduction of the Database

Section 2 01 The Classification of Databases A database is a collection of information that is organized so that it can easily be accessed, managed, and updated. In one view, databases can be classified according to types of content: bibliographic, text, numeric, and images. (1/5) The Classification of Databases

Section 2 01 The Classification of Databases In computing, databases are sometimes classified according to their organizational approach. The most prevalent approach is the relational database, a tabular database in which data is defined so that it can be reorganized and accessed in a number of different ways. (2/5) The Classification of Databases

Section 2 01 The Classification of Databases A distributed database is one that can be dispersed or replicated among different points in a network. An object-oriented programming database is one that is congruent with the data defined in object classes and subclasses. (3/5) The Classification of Databases

Section 2 01 The Classification of Databases Computer databases typically contain aggregations of data records or files, such as sales transactions, product catalogs and inventories. Typically, a database manager provides users the capabilities of controlling read / write access, specifying report generation, and analyzing usage. (4/5) The Classification of Databases

Section 2 01 The Classification of Databases Databases and database managers are prevalent in large mainframe systems. But they are also present in smaller distributed workstation and mid-range systems such as the AS / 400 and on personal computers. SQL (Structured Query Language) is a standard language for making interactive queries from and updating a database such as IBM’s DB2, Microsoft’s Access, and database products. (5/5) The Classification of Databases

Section 2 02 Relational Database A relational database is a collection of data items organized as a set of formally-described tables. And, the data can be accessed or reassembled in many different ways without having to reorganize the database tables. The relational database was invented by E. F. Codd at IBM in (1/3) The Classification of Databases

Section 2 02 Relational Database The standard user and application program interface to a relational database is the structured query language (SQL). SQL statements are used both for interactive queries for information from a relational database and for gathering data for reports. (2/3) The Classification of Databases

Section 2 02 Relational Database In addition to being relatively easy to create and access, a relational database has the important advantage of being easy to extend. After the original database creation, a new data category can be added without requiring that all existing applications be modified. (3/3) The Classification of Databases

Section How about letting yourself and others have access to a company database which is usable from any location hat has a browser with an Internet connection? The Web database concept makes sense if you and your people want to do work in various locations in or outside the office and still be “plugged” in. (1/4) 종합지문 : Web Database 2 The Classification of Databases

Section For example, you could have employees enter timesheets or have sales reps log their contacts. Or perhaps you’d like customers to be able to check the status of their orders online without having to call the company. Typically what happens is that a database such as Access or MySQL (basically just consisting of tables) would be put on the Web. (2/4) 종합지문 : Web Database 2 The Classification of Databases

Section Then “dynamic” Web pages (actually ASP pages which include VBScript, HTML, and / or JavaScript) would be created acting like the old desktop database’s queries, forms, and reports to access the database - all hosted on a Web Server. (3/4) 종합지문 : Web Database 2 The Classification of Databases

Section Dynamic Web pages are similar in many ways to regular HTML pages. But they are “live” because the user can read from and write to information in the database. (4/4) 종합지문 : Web Database 2 The Classification of Databases

Section 컴퓨터 생활 영어 The Classification of Databases

Section 컴퓨터 생활 영어 The Classification of Databases

Section 컴퓨터 생활 영어 The Classification of Databases

Section 응용 문장 2 You told me that I needed to spend more time with my computer books, so I turned their covers into icons. The Classification of Databases