'Primary key sid' presentation slideshows

Database Management Systems Chapter 3

Database Management Systems Chapter 3. The Relational Model. Why Study the Relational Model?. Most widely used model. Vendors: IBM, Informix, Microsoft, Oracle, Sybase, etc. Simple data representation and it can express complex queries. Recent competitor: object-oriented model

547 views • 54 slides

The Relational Model Chapter 3

The Relational Model Chapter 3. Publications. Frequently cited db publications based on google scholar ER model by P.P. Chen (1976) 7467 Relational model by E.F.Codd (1970) 7100 Most cited articles in CS http://citeseer.nj.nec.com/articles.html.

436 views • 41 slides

Intro to Database Systems and Relational Model

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SQL: DDL

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The Relational Model

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The Relational Model

339 views • 14 slides

The Relational Model

158 views • 14 slides

SQL constrains and keys

SQL constrains and keys. SORTED RESULTS. Sort the results by a specified criterion SELECT columns FROM tables WHERE predicates ORDER BY column ASC/DESC; select fname, sid from students order by fname ASC;. Constraints. not null validate conditions for fields Unique

207 views • 8 slides