Обсуждение: Index on a COALESCE function
, Hi, I'm trying to index on a coalesce function:
The index definition is CREATE INDEX emailrcpts_cid_
A portion of the query I am trying to optimize follows:
select 45198705,false,id,next_avail_senddate(id,date(send_date)) from
(select id,timeclause_combine(date(estmileage_timeclause(service_date,mileage,last_service_date,last_mileage,
date_of_purchase,year_purchased,10750,cid,serindex_date,id)),
date(date_larger(date(coalesce(date_of_purchase, '1900-01-01')+timespan('45 days')),
date(service_date+timespan('44 days')))),
date(null),date(create_date),9,false) as send_date,last_send
I can't seem to get this index to work on the function, just on the cid column. Any ideas would be appreciated
Thank you,
Mark Steben
Senior Database Administrator
@utoRevenue™
A Dominion Enterprises Company
480 Pleasant Street
Suite B200
Lee, MA 01238
413-243-4800 Home Office
413-243-4809 Corporate Fax
msteben@autorevenue.com
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--- Mark Steben <msteben@autorevenue.com> wrote:
> select 45198705,false,id,next_avail_senddate(id,date(send_date)) from
> (select
> id,timeclause_combine(date(estmileage_timeclause(service_date,mileage,last_s
> ervice_date,last_mileage,
> date_of_purchase,year_purchased,10750,cid,serindex_date,id)),
> date(date_larger(date(coalesce(date_of_purchase,
> '1900-01-01')+timespan('45 days')),
> date(service_date+timespan('44 days')))),
> date(null),date(create_date),9,false) as send_date,last_send
IIUC, indexs are only used in JOINS and WHERE conditions. I don't see either of those in your
query.
Regards,
Richard Broersma Jr.