Method and system for outer join of database tables
US11086872B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 2020 |
| Grant date | Aug 10, 2021 |
| Priority date | — |
| Expiry date | Nov 20, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/2456
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The specification provides a system, method, and storage medium for executing an outer join command on a first table and a second table in a distributed database. The method may comprise: broadcasting the first data set to a plurality of database nodes storing the second data set; dividing the plurality of database nodes into a first subset and a second subset; obtaining, an OUTER JOIN result based on the first data set broadcasted to each database node of the first subset and the portion of the second data set stored therein; obtaining, an INNER JOIN result based on the first data set broadcasted to each database node of the second subset and the portion of the second data set stored therein; and returning a result to the OUTER JOIN command by aggregating the OUTER JOIN result and the INNER JOIN result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.