Yes, that's correct, modifying the original ORDER BY gives:
ORDER BY lastname, firstname, refid, appldate DESC;
ERROR: SELECT DISTINCT ON expressions must match initial ORDER BY expressions
Using WITH works great:
WITH distinct_query AS (
SELECT DISTINCT ON (refid) id, refid, lastname, firstname, appldate
FROM appl WHERE lastname ILIKE 'Williamson%' AND firstname ILIKE 'd%'
GROUP BY refid, id, lastname, firstname, appldate
ORDER BY refid, appldate DESC
)
SELECT * FROM distinct_query ORDER BY lastname, firstname;
Thank you!
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