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PQL: Operasi Komposisi dan Jaringan Semantik Data
Data & Software Engineering Research Group
STEI-ITB, Jl. Ganeca No.10, Bandung 40132, Indonesia
Public Query Language (PQL) is the syntax of query for relational database, which is categorized as highly user friendly compared to the 4-th generation language (SQL, QBE, QUEL,etc.). As a query language, PQL is constructed as linear syntax(without block recursive). Visualization of the result is constructed as an entity (not tupple, as happened in SQL). As a consequence, duplication of data on the results could be rejected. Query process and the principle of visualization of result of PQL can be adapted as part of DBMS, using composition method (Composition Operator), developed as an interpretation of join operator and navigation, supported by Data Semantic Network. Both Composition Operator and Data Semantic Network are main topic discussed in this article, as the result of this research on PQL.
Keywords: database, functional dependency, navigation, Public Query language (PQL), query language, relational model, relational Operator