'Subtype entities' presentation slideshows

Lecture 12: Database Design

Prof. Ray Larson & Prof. Marc Davis UC Berkeley SIMS Tuesday and Thursday 10:30 am - 12:00 pm Fall 2003 http://www.sims.berkeley.edu/academics/courses/is202/f03/. Lecture 12: Database Design. SIMS 202: Information Organization and Retrieval. Lecture Overview. Review

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Weak Entity Types

Weak Entity Types. CSCI 6442. Most entity types are strong entity types, that exist independently from other entity types A strong entity type always has a unique identifier that distinguishes each occurrence of that entity type A weak entity type needs another entity type for its identifier

218 views • 6 slides