/* there is only 1 taxonobservation without a taxoninterpretation [1], so we can
just include one row for each taxoninterpretation. this allows us to use the
taxoninterpretation_id as the row_num.

[1]
SELECT *
FROM taxonobservation
LEFT JOIN taxoninterpretation USING (taxonobservation_id)
WHERE taxoninterpretation_id IS NULL
*/
SELECT *
FROM taxoninterpretation
LEFT JOIN taxonobservation    USING (taxonobservation_id)
LEFT JOIN plantconcept_       USING (plantconcept_id)
LEFT JOIN plantname           USING (plantname_id)
; -- runtime: 20 s ("Time: 20279.441 ms") @starscream