17966036. OUTER SEMI JOIN FOR DISJUNCTIVE SUBQUERY UNNESTING simplified abstract (Oracle International Corporation)
Contents
- 1 OUTER SEMI JOIN FOR DISJUNCTIVE SUBQUERY UNNESTING
- 1.1 Organization Name
- 1.2 Inventor(s)
- 1.3 OUTER SEMI JOIN FOR DISJUNCTIVE SUBQUERY UNNESTING - A simplified explanation of the abstract
- 1.4 Simplified Explanation
- 1.5 Potential Applications
- 1.6 Problems Solved
- 1.7 Benefits
- 1.8 Potential Commercial Applications
- 1.9 Possible Prior Art
- 1.10 Unanswered Questions
- 1.11 Original Abstract Submitted
OUTER SEMI JOIN FOR DISJUNCTIVE SUBQUERY UNNESTING
Organization Name
Oracle International Corporation
Inventor(s)
Angela Amor of Menlo Park CA (US)
Mohamed Ziauddin of Pleasanton CA (US)
OUTER SEMI JOIN FOR DISJUNCTIVE SUBQUERY UNNESTING - A simplified explanation of the abstract
This abstract first appeared for US patent application 17966036 titled 'OUTER SEMI JOIN FOR DISJUNCTIVE SUBQUERY UNNESTING
Simplified Explanation
An outer semi join (OSJ) is a new type of table join operation that combines the semantics of left outer join and semi-join. It introduces the concept of an anti-join marker (AJM) to specify whether a matching row was not found between joined tables for each result row in an OSJ operation. OSJ supports unnesting of disjunctive subqueries for execution plan optimization, avoiding the need for a distinct operator on the right table and allowing the use of inequality in connecting conditions of subqueries.
- Outer semi join (OSJ) combines left outer join and semi-join semantics.
- Anti-join marker (AJM) specifies if a matching row was not found between joined tables.
- OSJ supports unnesting of disjunctive subqueries for execution plan optimization.
- OSJ avoids the need for a distinct operator on the right table.
- OSJ allows the use of inequality in connecting conditions of subqueries.
Potential Applications
The technology of outer semi join (OSJ) can be applied in:
- Database management systems
- Query optimization
- Data analysis
Problems Solved
The technology of outer semi join (OSJ) solves the following problems:
- Optimizing execution plans for database queries
- Improving performance of join operations
- Enhancing the efficiency of data retrieval
Benefits
The benefits of using outer semi join (OSJ) technology include:
- Faster query processing
- Reduced resource consumption
- Improved overall database performance
Potential Commercial Applications
The technology of outer semi join (OSJ) can have potential commercial applications in:
- Database software development
- Data analytics platforms
- Business intelligence tools
Possible Prior Art
One possible prior art related to this technology is the concept of semi-join operations in database systems, which focus on optimizing join operations for better performance.
Unanswered Questions
How does OSJ compare to traditional join operations in terms of performance?
The article does not provide a direct comparison between OSJ and traditional join operations in terms of performance efficiency.
Are there any limitations or constraints when using OSJ in complex database queries?
The article does not mention any potential limitations or constraints when using OSJ in complex database queries.
Original Abstract Submitted
A new type of table join operation, outer semi join (OSJ), is provided, which can be used by an optimizer layer and an execution layer of a database management system (DBMS). OSJ combines the semantics of both left outer-join and semi-join. The concept of an anti-join marker (AJM) is also introduced, which specifies whether a matching row was not found between joined tables for each result row in an OSJ operation. The OSJ operation supports unnesting of a class of disjunctive ANY, ALL, EXISTS, NOT EXISTS, IN, and NOT IN subqueries for execution plan optimization. The disjunction may contain filter predicates. For unnesting, OSJ avoids the need of using a distinct operator on the right table and also supports using inequality (e.g. >, >=, <, <=) in connecting or correlating conditions of subqueries, rather than being limited to equality only.
