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Get minimum start date

Author

Topic

Vack
Aged Yak Warrior

530 Posts

Posted - 2014-11-12 : 10:08:06

I'm looking at the following Records:


  cust_no     item_no     start_dt    end_dt         price
    1060       2931       2011-02-06   9999-12-31    1.23
    1060       2931       2011-04-18   9999-12-31    2.00

I want to be able to pull the records with the earliest date 2011-02-06
There were other records with this same customer and item number. I used this script to return the two above.

select *
from price
where end_dt > getdate()

Now I need to add something so it only returns the record with the earliest date. I'm going to run this on a table that has many customer and item combinations.

gbritton
Master Smack Fu Yak Hacker

2780 Posts

Posted - 2014-11-12 : 10:30:47

SELECT p.cust_no, p.item_no, p.start_dt, p.end_dt, p.price
FROM price p
CROSS APPLY (
SELECT min(p1.start_dt) start_dt
FROM @price p1
WHERE p.cust_no = p1.cust_no
AND p.item_no = p1.item_no
) p1
WHERE p.end_dt > getdate()
AND p.start_dt = p1.start_dt

Bustaz Kool
Master Smack Fu Yak Hacker

1834 Posts

Posted - 2014-11-12 : 10:37:59

[code]select
a.cust_no,
a.item_no,
a.start_dt,
a.end_dt,
a.price
from (
select p.*, row_number() over (partition by p.cust_no, p.item_no order by p.start_dt) rn
from price p
where end_dt > GETDATE()
) a
where
a.rn = 1[/code]

No amount of belief makes something a fact. -James Randi

gbritton
Master Smack Fu Yak Hacker

2780 Posts

Posted - 2014-11-12 : 10:51:07

Or:


SELECT p.cust_no, p.item_no, p.end_dt, p.price, p.start_dt
FROM (
	SELECT p.cust_no, p.item_no, p.end_dt, p.price, p.start_dt,
		min(p.start_dt) over(PARTITION BY p.cust_no, p.item_no) as min_start_dt
	FROM price p
	WHERE p.end_dt > getdate()
	) p
WHERE p.start_dt = p.min_start_dt

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