Re: A way to generate PK-strings or new blank nodes

Hello David,


Fabian - I may not properly understand what you are asking, but perhaps this
> would work: write a SQL query to query the underlying data and include a row
> identifier column. Use that query as a logical table in an R2RML mapping and
> define the subject URI in terms of the row identifier.
>
>
What I mean is that I can make such a query using
PostGreSQL STRING_AGG function, or using MySQL
CONCAT_WS function, or using Oracle WM_CONCAT
function, etc. but I don't think there exists a
standard SQL way to do this. The only GROUP BY
functions allowed by the standard are COUNT, SUM,
AVG, MIN and MAX if I'm up to date ...