[SQL] Subselect has too many or too few fields
От | Oleg Bartunov |
---|---|
Тема | [SQL] Subselect has too many or too few fields |
Дата | |
Msg-id | Pine.GSO.3.96.SK.990325194203.29307D-100000@ra обсуждение исходный текст |
Список | pgsql-sql |
I have a problem with query I thought must works: c_flats=> select source, max(up_date) as max_update, count(*) from flats where u up_date in (select max(up_date) from flats group by source) group by source; ERROR: parser: Subselect has too many or too few fields. Internal subselect produces as expected: c_flats=> select max(up_date) from flats group by source; max ---------- 15-03-1999 11-03-1999 24-03-1999 24-03-1999 24-03-1999 And I don't see a reason my query doesn't works. If I substite the result of internal subselect I get what I need (there are cyrillic characters in <source>) c_flats=> select source, max(up_date) as max_update, count(*) from flats where u p_date in ('15-03-1999','11-03-1999','24-03-1999','24-03-1999','24-03-1999') gro up by source; source |max_update|count --------------------------+----------+----- ИНКОМ 369-00-25, 365-10-38|15-03-1999| 674 Корнет 912-00-12 |11-03-1999| 47 МИАН 974-62-62 |24-03-1999| 393 МИЭЛЬ 217-30-20, 217-39-13|24-03-1999| 1 МЦБН <null> |24-03-1999| 141 (5 rows) Regards, Oleg _____________________________________________________________ Oleg Bartunov, sci.researcher, hostmaster of AstroNet, Sternberg Astronomical Institute, Moscow University (Russia) Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/ phone: +007(095)939-16-83, +007(095)939-23-83
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