ISSUE-21: Allow logical tables to be joined via either an inner or an outer join
inner/outer joins
Allow logical tables to be joined via either an inner or an outer join
- State:
- CLOSED
- Product:
- R2RML
- Raised by:
- David McNeil
- Opened on:
- 2011-02-01
- Description:
- Allow two logical tables to be joined via either an inner or an outer join.
I don't see any means to specify inner/outer joins as part of a
joinCondition. This would be useful in cases where null values in the joined
table are used to generate triples in the output. - Related Actions Items:
- No related actions
- Related emails:
- Re: RDB2RDF WG agenda for 2011-03-08 meeting 1700 UTC (from michael.hausenblas@deri.org on 2011-03-08)
- Re: RDB2RDF WG agenda for 2011-03-08 meeting 1700 UTC (from bertails@w3.org on 2011-03-07)
- RDB2RDF WG agenda for 2011-03-08 meeting 1700 UTC (from michael.hausenblas@deri.org on 2011-03-06)
- Re: SQL in R2RML mappings (from dmcneil@revelytix.com on 2011-02-01)
- ISSUE-21 (inner/outer joins): Allow logical tables to be joined via either an inner or an outer join [R2RML] (from sysbot+tracker@w3.org on 2011-02-01)
Related notes:
As I understand the spec now this is not an issue. The joinCondition is only used in RefObjectMap and there is no value from being able to do an outer join because the null values would not produce any triples.
So I am closing this.
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