'Modification anomalies' presentation slideshows

Schema Refinement and Normal Forms

Schema Refinement and Normal Forms. Review: Database Design. Requirements Analysis user needs; what must database do? Conceptual Design high level description (often done w/ER model) Logical Design translate ER into DBMS data model Schema Refinement consistency, normalization

1.76k views • 134 slides

Relational Database Systems

Relational Database Systems. Higher Information Systems. The Relational Model. data is grouped into entities which are related, in order to minimise data duplication and achieve data integrity many-to-many relationships between entities are removed and replaced with one-to-many relationships.

1.24k views • 63 slides

Relational Database Systems

Relational Database Systems. Higher Information Systems. The Relational Model. data is grouped into entities which are related, in order to minimise data duplication and achieve data integrity many-to-many relationships between entities are removed and replaced with one-to-many relationships.

758 views • 63 slides

Data Modeling and Database Design

600 views • 47 slides

Ch 4: Relational Database Design

Ch 4: Relational Database Design. 4.1 Features of Good Relational designs. Four Informal measures Semantics of the relation attributes Reducing the redundant values in tuples. Reducing the null values Disallowing the possibility of generating spurious(wrong) tuples.

537 views • 38 slides

Chapter 5: Relational Database

540 views • 37 slides

Normalization of Relational Tables

Normalization of Relational Tables. Outline . Modification anomalies Functional dependencies Major normal forms Relationship independence Practical concerns. Modification Anomalies. Unexpected side effect Insert, modify, and delete more data than desired Caused by excessive redundancies

525 views • 36 slides

Chapter 7

Chapter 7. Normalization. Outline. Modification anomalies Functional dependencies Major normal forms Relationship independence Practical concerns. Modification Anomalies. Unexpected side effect Insert, modify, and delete more data than desired Caused by excessive redundancies

414 views • 31 slides

Chapter 7

Chapter 7. Normalization. Outline. Modification anomalies Functional dependencies Major normal forms Relationship independence Practical concerns. Modification Anomalies. Unexpected side effect Insert, modify, and delete more data than desired Caused by excessive redundancies

408 views • 31 slides

Data Modeling

398 views • 27 slides

Normalisation

413 views • 24 slides

Update Anomalies

Update Anomalies. CS157B By : Anh Ngo. Data Redundancy. The duplication of information within a table Example: Duplicated information: Information: Branch [B1] located at [6 Lanark Square]. Update Anomalies.

1.39k views • 21 slides

Database Design

Database Design. Conceptual identify important entities and relationships determine attribute domains and candidate keys draw the E-R diagram Logical validate model using normalization Physical implement on DBMS. Logical Design. Split data into multiple tables, such that

371 views • 19 slides