'Datalog rules' presentation slideshows

Database Systems Logical Query Languages

Database Systems Logical Query Languages. assoc. prof., dr. Vladimir Dimitrov e-mail: cht@fmi.uni-sofia.bg web: is.fmi.uni-sofia.bg. A Logic for Relations Predicates and Atoms Arithmetic Atoms Datalog Rules and Queries Meaning of Datalog Rules Extensional and Intensional Predicates

1.08k views • 88 slides

Datalog

Datalog. Logical Rules Recursion. Logic As a Query Language. If-then logical rules have been used in many systems. Important example : EII (Enterprise Information Integration). Nonrecursive rules are equivalent to the core relational algebra.

646 views • 51 slides

Datalog

Datalog. Logical Rules Recursion. Logic As a Query Language. If-then logical rules have been used in many systems. Important example : EII (Enterprise Information Integration). Nonrecursive rules are equivalent to the core relational algebra.

669 views • 51 slides

What is that the paper deals with?

Describing and Using Query Capabilities of Heterogeneous Sources Vasilis Vassalos& Yannis Papakonstantinou Presented by Srujan Kothapally. What is that the paper deals with?.

460 views • 35 slides

Data Models and Query Languages

Data Models and Query Languages. CSE 590DB, Winter 1999 Theory of Databases Zack Ives January 10, 1999. NewMovies Name Rating Director The Phantom Menace PG George Lucas Patch Adams PG-13 Tom Shadyac Stepmom PG-13 Chris Columbus. The Relational Model.

222 views • 21 slides

Embedded SQL

Embedded SQL. Direct SQL is rarely used: usually, SQL is embedded in some application code. We need some method to reference SQL statements. But: there is an impedance mismatch problem So: we use cursors. Programs with SQL. Host language + Embedded SQL. Preprocessor. Preprocessor.

475 views • 20 slides

Embedded SQL

Embedded SQL. Direct SQL is rarely used: usually, SQL is embedded in some application code. We need some method to reference SQL statements. But: there is an impedance mismatch problem So: we use cursors. Programs with SQL. Host language + Embedded SQL. Preprocessor. Preprocessor.

286 views • 20 slides

Datalog

Datalog. Inspired by the impedance mismatch in relational databases. Main expressive advantage: recursive queries. More convenient for analysis: papers look better. Without recursion but with negation it is equivalent in power to relational algebra

229 views • 11 slides

Logic Based Query Languages

Logic Based Query Languages. Relational calculus:. Datalog: - enables expressing recursive queries - more convenient for analysis - without recursion but with negation it is equivalent in power to relational algebra. Datalog Concepts. Atoms Datalog rules, datalog programs

231 views • 11 slides

Datalog

Datalog. Inspired by the impedance mismatch in relational databases. Main expressive advantage: recursive queries. More convenient for analysis: papers look better. Without recursion but with negation it is equivalent in power to relational algebra

150 views • 11 slides

Row Types in SQL-3

Row Types in SQL-3. Row types define types for tuples, and they can be nested. CREATE ROW TYPE AddressType{ street CHAR(50), city CHAR(25), zipcode CHAR(10) } CREATE ROW TYPE PersonType{ name CHAR(30), address AddressType,

192 views • 10 slides

Chapter 5: Other Relational Languages

214 views • 8 slides

Final Review

Final Review. Datalog (Ch 10) Rules and queries RA expressions for Datalog rules Datalog program as a query expression and rectification Concept of Safety Negation combined with Recursion Safe and Stratified Rules Fixed Point Solution for recursive and non-recursive datalog programs.

84 views • 7 slides

Some Recursive Queries

Some Recursive Queries. List Reverse. (b) Unhappy with the results of (a), our instructor now decides that everyone above the median should get an A, and the rest should get a B.

159 views • 6 slides