| From: | Francisco Olarte <folarte(at)peoplecall(dot)com> |
|---|---|
| To: | Narayanan Iyer <nars(at)yottadb(dot)com> |
| Cc: | PostgreSQL mailing lists <pgsql-bugs(at)lists(dot)postgresql(dot)org>, support(at)yottadb(dot)com |
| Subject: | Re: GROUP BY using tablename.* does not work if tablename has 1 column with NULL values |
| Date: | 2021-10-11 14:00:11 |
| Message-ID: | CA+bJJbz9OWmL_gKAPTUkHxv7HjDgcrO1aR0o-cjhhHRQSy6B7w@mail.gmail.com |
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| Lists: | pgsql-bugs |
Narayanan:
On Mon, 11 Oct 2021 at 14:10, Narayanan Iyer <nars(at)yottadb(dot)com> wrote:
...
> You are right. My inner query was an outer join returning 3 rows. But what I did not understand was that the NULLs in 2 of the 3 rows were different because 1 was a composite NULL and 1 was a ROW(NULL) and hence they showed up as 2 different NULLs/rows even after a GROUP BY. Tom's explanation cleared it up for me.
Perfect. null rows, row(null) and siblings are extremely tricky, I
always try to avoid them, just pointed it in case you did not run the
subquery first and counted results.
Francisco Olarte.
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