'Complex ra expressions pname' presentation slideshows

C20.0046: Database Management Systems Lecture #8

C20.0046: Database Management Systems Lecture #8. M.P. Johnson Stern School of Business, NYU Spring, 2008. Agenda. Subqueries, etc. Hw1 on Blackboard. Relation operators. Basic operators: Selection: s Projection: P Cartesian Product: ? Other set-theoretic ops: Union: ?

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Lecture 11: Functional Dependencies

Lecture 11: Functional Dependencies. January 31 st , 2003. Outline. Relational decomposition Normal forms Begin relational algebra . Relational Schema Design. Recall set attributes (persons with several phones):. SSN ? Name, City , but not SSN ? PhoneNumber. Anomalies:

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Lecture 13: Relational Decomposition and Relational Algebra

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Lecture 07: Relational Algebra

Lecture 07: Relational Algebra. Outline. Relational Algebra (Section 6.1). Relational Algebra. Formalism for creating new relations from existing ones Its place in the big picture:. Declarative query language. Algebra. Implementation. Relational algebra. SQL, relational calculus.

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C20.0046: Database Management Systems Lecture #10

C20.0046: Database Management Systems Lecture #10. Matthew P. Johnson Stern School of Business, NYU Spring, 2005. Next topic: SQL. Standard language for querying and manipulating data Structured Query Language Many standards: ANSI SQL, SQL92/SQL2, SQL3/SQL99

361 views • 24 slides