Finding difference between two dates

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Finding difference between two dates

Author

Topic

crugerenator
Posting Yak Master

126 Posts

Posted - 2008-09-08 : 11:42:41

I'm trying to write a select statement where i return only rows with the shortest amount of time between two dates.

For example:


select    userID,
          deliveryDate,
          orderdDate

from      Orders

where     (Amount of time between orderDate and deliveryDate is   
          smallest)
          and deliveryDate > GetDate()+2

TG
Master Smack Fu Yak Hacker

6065 Posts

Posted - 2008-09-08 : 13:12:25

Do you want just one row returned or perhaps one row per userID?

Are you using sql server 2005 (or greater)?

Be One with the Optimizer
TG

TG
Master Smack Fu Yak Hacker

6065 Posts

Posted - 2008-09-08 : 13:20:02

assuming 2005 and one row per userID - here's one way:


select userID,
       deliveryDate,
       orderdDate
from   (
       select    userID,
                 deliveryDate,
                 orderdDate,
                 row_Number() over (partition by userID order by datediff(millisecond, orderDate, deliveryDate)) as rn
       from      Orders
       where     deliveryDate > GetDate()+2 
       ) d
where  d.rn = 1

Be One with the Optimizer
TG

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