I need a table

           Ordername  Orderplaced    Ordercompleted

           A          00:12:56       01:24:42
           B          01:15:20       01:45:30

I need the result in this form :-

        Ordertime        count(orders)
        00:00             0
        00:01             0
        00:12             0
        00:13             1
        00:14             1
        01:16             2
        01:17             2
        01:25             1
        01:26             1
        01:46             0



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asked Jan 09 at 11:22 AM in Default

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31 1 5

What have you tried so far?

Jan 09 at 12:08 PM JohnM
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2 answers: sort voted first

The below script is completely untested, but if it doesn't work, I think you can still get the idea from it. It uses a few CTEs to generate times from 12:00 to midnight and then left joins from that to the orders table to get the counts.

 with tens as (
 select n from (values(1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) t(n)
 ), thousands as (
 select row_number() over(order by t.n) -1 as rn
 from tens t
 cross join tens t2
 cross join tens t3
 cross join tens t4
 cross join tens t5
 ),minutes as (
 select dateadd(minute,rn,cast('12:00' as time)) as the_time
 from thousands where dateadd(minute,rn,cast('12:00' as time)) < ='23:59'
 select m.the_time, count(*) from
 minutes m
 left join thetablewithorders o
 on m.the_time >= o.orderplaced and m.the_time < o.ordercompleted
 group by m.the_time

order by m.the_time;

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answered Jan 09 at 01:17 PM

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Magnus Ahlkvist
22.5k 20 44 43

Yes, that's correct. But I create the time dimension in a CTE instead of materializing it in a table. Ideally, one would create an inline table valued function of the CTE generating time slots, so the solution can become somewhat more flexible (change interval from one minute to five minutes, change start and end time etc).

Jan 10 at 09:43 AM Magnus Ahlkvist
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Here's another solution (basically the same as the above example)

 declare @orders table(Ordername varchar(54), Orderplaced datetime , Ordercompleted datetime)
 insert into @orders
 ('A','2017-12-30 00:12:56', '2017-12-30 01:24:42')
 ,('B','2017-12-30 01:15:20', '2017-12-30 01:45:30')
 --minutes table
 declare @Minutes table([Minute] varchar(5)) 
 declare @ToDay datetime = '2018-01-09 00:00:00' 
 --loop to fill minutes table with all minutes in a day
 cast(@ToDay as Date) <'2018-01-10'
     insert into @Minutes(Minute) select left(cast( @ToDay as Time),5)
     set @ToDay =  DATEADD(MINUTE,1, @ToDay)
 --get number of active orders per minute
 select a.Minute, isnull(count(b.Ordername),0) as orders
 from @Minutes a
 left join @orders b
 on a.Minute between left(cast( b.Orderplaced as time),5)  and left(cast( b.Ordercompleted as time),5)
 a.Minute <= (select left(cast(getdate() as time),5))
 group by a.Minute
 order by 1
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answered Jan 09 at 01:33 PM

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31 3

reformatted code

Jan 09 at 02:00 PM ThomasRushton ♦♦
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asked: Jan 09 at 11:22 AM

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