SQL Server fetch columns based on specific row numbers - sql

Question

I have a requirement where I need to select last one year orders based on email (billing address email address). I need to show order number, shipping first name, shipping last name, billing address email id and item descriptions along with submitted date. Same address table use to store shipping (ship_to 1) and billing address (ship_to always 0). The email field in shipping address is optional and if both the addresses match only billing address is written to DB.
Address:
Order_num first_name last_name email ship_to_num
-----------------------------------------------------------
ord1 abc abc abc#c.com 0
ord1 cdf ccc XXc#m.com 1
I wrote a initial query like below:
select
addr.first_name, addr.last_name, addr.order_num, addr.Update_Date_Time,
ord.Order_Amt, item.Item_Desc
from
ADDR addr
inner join
ORDER ord on ord.Order_num = addr.Order_Num
inner join
ITEM item on ord.Order_num = item.Order_Num
where
addr.Order_Num in (select Order_num
from TOEADDR addr
where addr.ShipTo_Num = 0
and addr.EM_EMAIL_ADDR = 'avc#abc.com'
and addr.Update_Date_Time > DATEADD(year,-1, GETDATE()))
order by
addr.Update_Date_Time desc
Is there any way I can add this logic to above query:
(SELECT TOP 1 First_Name, LAST_NAME FROM ADDR ORDER BY ShipTo_Num ASC)
Thanks, with CTE it worked like a charm. Below is the final query:
;with cte_addr
AS
(SELECT First_Name,LAST_NAME, EM_EMAIL_ADDR, order_num,Update_Date_Time,ShipTo_Num
, ROW_NUMBER() OVER (PARTITION BY order_num ORDER BY ShipTo_Num desc) as ROWID
FROM ADDR
)
SELECT addr.first_name , addr.last_name, addr.order_num, addr.Update_Date_Time,
ord.Order_Amt, item.Item_Desc
FROM cte_addr addr
inner join ORDER ord on ord.Order_num = addr.Order_Num
inner join ITEM item on ord.Order_num = item.Order_Num
WHERE addr.ROWID =1 and
addr.Order_Num in(
select Order_num from ADDR billAddress where
billAddress.ShipTo_Num = 0 and billAddress.EM_EMAIL_ADDR = 'afv#abv.com'
and billAddress.Update_Date_Time > DATEADD(year,-1,GETDATE())
)
order by addr.Update_Date_Time desc

Answer 1

You can use CTE to achieve it. You can write query like below. This can be a sample query for the logic you are looking for
;with cte_addr
AS
(SELECT First_Name,LAST_NAME, email EM_EMAIL_ADDR, order_num,Update_Date_Time,ShipTo_Num
, ROW_NUMBER() OVER (PARTITION BY First_Name,LAST_NAME ORDER BY ShipTo_Num) ROWID
FROM ADDR
)
SELECT addr.first_name , addr.last_name, addr.order_num, addr.Update_Date_Time,
ord.Order_Amt, item.Item_Desc
FROM cte_addr addr
inner join ORDER ord on ord.Order_num = addr.Order_Num
inner join ITEM item on ord.Order_num = item.Order_Num
WHERE t.ROWID =1
and addr.Order_Num in(
select Order_num from TOEADDR addr where
addr.ShipTo_Num = 0 and addr.EM_EMAIL_ADDR = 'avc#avc.com'
and addr.Update_Date_Time > DATEADD(year,-1,GETDATE())
)
order by addr.Update_Date_Time desc