Databases & Consistency

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Presentation transcript:

Databases & Consistency

Database Relational databases : dominant information storage/retrieval system

Database Data stored in tables Each row is a record

Database Data stored in tables Each row is a record Columns define attributes

Normalized Data Keys : attribute that uniquely identifies record

Queries Interact with DB's via queries SELECT : retrieve some data

Queries Interact with DB's via queries WHERE : Limits scope

Queries Interact with DB's via queries UPDATE : modify some data

Repetitive Data Duplication of data Wasteful Hard to modify

Normalized Data Goal : represent each piece of data only once Break into separate tables

Normalized Data Use key to look up related records CustomerID in Orders says which Customer made order

Task Given these two table, print customer name and sale amount for orders on 5/7/2004

Virtual Table Trick Join : merge two tables based on keys

Join Samples Using a Join between Movies and Boxoffice