On 03.12.2010 23:53, Oleg Bartunov wrote:
create table qq (b box);
CREATE TABLE
select count(*), b from qq group by b;
ERROR: could not identify an equality operator for type box
LINE 1: select count(*), b from qq group by b;
but following select works fine
select ' (43.6038,48.8664536),(1.3620777,1.44327)'::box = '
(43.6038,48.8664536),(1.3620777,1.44327)'::box;
?column? ----------
t
(1 row)
^
What does it means ?
GROUP BY requires b-tree sort operators. Although there is a '='
operator for box, there is no b-tree opclass.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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