background: Using OLEDB driver to connect to a VFP database. Scripting: php
below is a sample set of data item purchases:
partno purch_date price
A 04/02/2012 95
A 04/01/2012 100
B 02/28/2012 55
B 03/15/2012 60
what i want to do is to build a select query that would get the prices of the latest purchase price based on the date. this sounds simple enough but i could not for the life of me figure out how to do this. it seems like there must be an aggregate function that i dont know about. im thinking it should be something like the following:
SELECT partno, max(purch_date) as lastest_purch_date, price FROM table GROUP BY partno
this query will not work because VFP will require an aggregate function for all fields selected. what im missing is a function or someway to tell vfp that i want the price corresponding to max(purch_date)
any help will be greatly appreciated. thanks.
Try this
select b.partno,b.purdate,c.price
from
(
select max(a.purdate) purdate,partno from table a
group by a.partno
)b,
table c
where b.partno=c.partno and b.purdate=c.purdate
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