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데이터베이스프리젠테이션

저작시기 2007.04 |등록일 2008.03.29 파워포인트파일MS 파워포인트 (ppt) | 18페이지 | 가격 3,000원

목차

■ Creating a Report including two tables

■ Summary

Relational model

Relation

Key

Null value

Functional dependency & determinant

Normalization

본문내용

■ Summary
1. Relational Model
● Standard in database
● Published by E.F Codd (1970)
2. Relations

3. key
Key is one or more columns used to identify a row
1) Composite key
● Two or more attribute keys
2) Candidate key
● A relation has one primary key
● A relation has another unique keys
→ Called Candidate key
3) Surrogate key
● Unique, numeric value to serve as the primary key
4) Foreign key
● Representation of a relationship
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