Object oriented query path expression to relational outer...

Details Object oriented query path expression to relational outer... Object oriented query path expression to relational outer...

2003-09-23

2008-09-16

Le, Miranda (Department: 2167)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000, C707S793000

Reexamination Certificate

active

07426522

ABSTRACT:
A path expression is translated to a relational database outer join by analyzing each path expression defined in each level of the object oriented query, and by identifying each path expression which can be a candidate for a translation to an outer join. The path expressions are ordered staffing with path expressions defined in a FROM clause. These ordered path expressions are grouped sequentially based upon on a source-target dependency between ordered path expressions and based upon the identifications as a candidate for a translation to an outer join. A quantifier is created for each path expression, said quantifier comprising a variable representing a table in a relational database, and each grouped path expression is replaced with a corresponding quantifier and related table in a relational database. A translation of the object oriented query to a relational query is then completed.

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