H2 doesn't support stepping through an index backwards, you would need
to create a reverse index to support that.
Something like :
create index idx_id_desc on test(id desc)
On 2012-06-07 16:04, Petr Holik wrote:
Hello,
I am little bit unsure when index is used for sorting and when not. I
have two almost same SQL first uses sort using index and second not.
The only difference is in DESC keyword.
the SQL is as follows:
select * from bills where closedtime< '2012-06-08 12:04:36.343 ' AND
CLOSED = TRUE order by closedtime limit 1
select * from bills where closedtime< '2012-06-08 12:04:36.343 ' AND
CLOSED = TRUE order by closedtime DESC limit 1
of course i can supply explain analyze if needed. Second query on same
data is about 10 - 100 times slower(does not use index for sorting)
Where is mistake or am I missing something?
Sincerely Petr Holik
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