'Relational algebra calculus' diaporamas de présentation

Relational Calculus

?. Relational Calculus. ?. CS 186, Fall 2005 R&G, Chapter 4. We will occasionally use this arrow notation unless there is danger of no confusion. Ronald Graham Elements of Ramsey Theory. Relational Calculus.

568 views • 44 slides

Lecture 3: System R

478 views • 32 slides

Lecture 3: System R

407 views • 32 slides

Relational Calculus

?. Relational Calculus. ?. Logic, like whiskey, loses its beneficial effect when taken in too large quantities. --Lord Dunsany. Relational Calculus. Query has the form: { T | p ( T )} p(T) is a formula containing T Answer = tuples T for which p ( T ) = true . Formulae.

337 views • 22 slides

Chapter 4, Part B

Relational Calculus. Chapter 4, Part B. Relational Calculus. Relational Algebra provides a set of operations ( that can be used to compute a desired relation from the database (i.e., procedural language)

224 views • 22 slides

Relational Algebra

Relational Algebra. Relational Model: Topic 3. Preliminaries. A query is applied to relation instances , and the result of a query is also a relation instance. Schemas of input relations for a query are fixed (but query will run regardless of instance!)

240 views • 20 slides

439 views • 19 slides

Relational Calculus

?. Relational Calculus. ?. CS 186, Spring 2006, Lecture 9 R&G, Chapter 4. We will occasionally use this arrow notation unless there is danger of no confusion. Ronald Graham Elements of Ramsey Theory. Relational Calculus.

519 views • 18 slides

Relational Calculus

?. Relational Calculus. ?. CS 186, Spring 2006, Lecture 9 R&G, Chapter 4. We will occasionally use this arrow notation unless there is danger of no confusion. Ronald Graham Elements of Ramsey Theory. Relational Calculus.

204 views • 18 slides

Relational Calculus

Relational Calculus. R&G, Chapter 4. Relational Calculus. Comes in two flavors: Tuple relational calculus (TRC) and Domain relational calculus (DRC) . Calculus has variables, constants, comparison ops , logical connectives and quantifiers .

457 views • 16 slides

Relational Calculus

?. Relational Calculus. ?. R&G, Chapter 4. We will occasionally use this arrow notation unless there is danger of no confusion. Ronald Graham Elements of Ramsey Theory. Relational Calculus. Query has the form: { T | p ( T )} p(T) is a formula containing T

241 views • 13 slides