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* date interpolation
@ 2003-05-25 21:44 Rob Wood <rhwood@dobber.ca>
2003-05-26 02:37 ` Re: date interpolation Rod Taylor <rbt@rbt.ca>
0 siblings, 1 reply; 2+ messages in thread
From: Rob Wood @ 2003-05-25 21:44 UTC (permalink / raw)
To: pgsql-sql
I am looking for a way to interpolate dates to create a nice output table.
example:
given this table:
id | start_date | end_date
----+------------+-----------
101 | 2003-02-03 | 2003-02-05
102 | 2003-03-20 | 2003-03-24
:
:
I am looking for a SELECT to retrieve this table:
id | date
----+------------
101 | 2003-02-03
101 | 2003-02-04
101 | 2003-02-05
102 | 2003-03-20
102 | 2003-03-21
102 | 2003-03-22
102 | 2003-03-23
102 | 2003-03-24
:
:
So far the closest solution I have come up with involves creating a dummy
table that contains a long list of dates that I can JOIN against in order
to fill in the interpolated values. It doesn't work very well, and gets
slow with large tables.
any clever ideas would be appreciated.
Rob
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: date interpolation
2003-05-25 21:44 date interpolation Rob Wood <rhwood@dobber.ca>
@ 2003-05-26 02:37 ` Rod Taylor <rbt@rbt.ca>
0 siblings, 0 replies; 2+ messages in thread
From: Rod Taylor @ 2003-05-26 02:37 UTC (permalink / raw)
To: Rob Wood <rhwood@dobber.ca>; +Cc: pgsql-sql
> So far the closest solution I have come up with involves creating a dummy
> table that contains a long list of dates that I can JOIN against in order
> to fill in the interpolated values. It doesn't work very well, and gets
> slow with large tables.
Looks to me like the perfect candidate for a Set Returning Function.
--
Rod Taylor <rbt@rbt.ca>
PGP Key: http://www.rbt.ca/rbtpub.asc
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2003-05-25 21:44 date interpolation Rob Wood <rhwood@dobber.ca>
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