Hello,
> I have a table which stores an event date. The event is stored as a
> standard mm/dd/yy entry.
>
> I then need to calculate based on the dd value, WHICH day of the
> week that is (e.g. Wednesday) and which occurrence of that day of
> the week, within the month, it is (e.g. the THIRD Wednesday).
>
Here is an example to reach this far ....
postgres=# create table mt(myd date);
postgres=# insert into mt select current_date+se from (select
generate_series(1,10000) as se ) as x;
postgres=# select * from mt order by
postgres-# myd limit 10; myd
------------2010-12-042010-12-052010-12-062010-12-072010-12-082010-12-092010-12-102010-12-112010-12-122010-12-13
(10 rows)
This is the query to get the data in the format you want...
select myd, d ,w from (
select myd, to_char(myd,'Day') as d , to_char(myd,'W') as w ,rank() over
(partition by to_char(myd,'W') order by myd ) as x from mt order by myd
) as t order by myd ;
myd | d | w
------------+-----------+---2010-12-04 | Saturday | 12010-12-05 | Sunday | 12010-12-06 | Monday | 12010-12-07 |
Tuesday | 12010-12-08 | Wednesday | 22010-12-09 | Thursday | 22010-12-10 | Friday | 22010-12-11 | Saturday |
22010-12-12| Sunday | 22010-12-13 | Monday | 22010-12-14 | Tuesday | 22010-12-15 | Wednesday | 32010-12-16 |
Thursday | 32010-12-17 | Friday | 32010-12-18 | Saturday | 32010-12-19 | Sunday | 32010-12-20 | Monday |
32010-12-21| Tuesday | 32010-12-22 | Wednesday | 42010-12-23 | Thursday | 42010-12-24 | Friday | 42010-12-25 |
Saturday | 42010-12-26 | Sunday | 42010-12-27 | Monday | 42010-12-28 | Tuesday | 42010-12-29 | Wednesday |
52010-12-30| Thursday | 52010-12-31 | Friday | 5
Regards,
Jayadevan
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