mail@eduard-wulff.de writes:
> SELECT vorgangt.id,
> (regexp_matches(vorgangt.text, '#\w{5,26}', 's'))[1] AS sernr,
> regexp_replace(vorgangt.text, '\n', 'â', 'g') AS text_in_einer_zeile
> FROM vorgangt ORDER BY 1
> This works to get the first match if there is one.
> BUT: it also _eliminates_ all rows that do not match from the result set
I see no bug here. You've got a set-returning function in the target
list, and when it returns zero rows, you get zero rows (from that source
row). You seem to wish it would return a scalar NULL for no match,
but that's not how the function is defined.
You could do it like this instead:
SELECT vorgangt.id,
(SELECT regexp_matches(vorgangt.text, '#\w{5,26}', 's'))[1] AS sernr,
regexp_replace(vorgangt.text, '\n', 'â', 'g') AS text_in_einer_zeile
FROM vorgangt ORDER BY 1
Or you could wrap regexp_matches in a non-set-returning function.
regards, tom lane
