Question

I have the following data:

ID       Date                 interval  interval_date            tot_activity  non-activity
22190   2011-09-27 00:00:00     1000    2011-09-27 10:00:00.000     265           15

I have another table with this data:

Date                        ID             Start                END               sched_non_activity     non_activity
10/3/2011 12:00:00 AM   HBLV-22267  10/3/2011 2:02:00 PM    10/3/2011 2:11:00 PM    540          

Now, in the second table’s non_activity field, I would like this to be the value from the first table. However, I need to capture the tot_activity – non_activity where the intervals(in 15 min increments) from the first table, fall in the same time frame as the start and end of the second table.

I have tried setting variables and setting a loop where for each row it verifies the starttime by interval, but I have no idea how to return a variable with only one record, as I keep getting errors that my variable is getting too many results.

I have tried looking everywhere for tutorials and I can’t find anything to help me out. Anyone have any pointers or tutorials on looping they could share?

Answer 1

You need to generate the interval end dates somehow; I’m assuming that there is always a record in the first table with a 15 minute interval record. In this case, an example would look like this:

;WITH Intervals
AS
(SELECT
     Interval_date
     ,DATEADD(ms,840997,Interval_date) AS interval_end
    ,nonactivity
FROM A)

--Select query for Validation
--SELECT 
--  b.[Date]
--  ,b.ID 
--  ,b.Start
--  ,b.sched_non_activity
--  ,i.nonactivity
--FROM B
--JOIN Intervals AS i
--ON b.Start >= i.Interval_date 
--AND b.[END] <= i.interval_end 

UPDATE B
    SET non_activity = i.nonactivity
FROM  B
JOIN Intervals AS i
ON b.Start >= i.Interval_date   
AND b.[END] <= i.interval_end   

Obviously, you might need to tweak this depending on the exact circumstances.