TSQL Join query help

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TSQL Join query help

Gators

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Points: 106
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February 7, 2013 at 12:51 pm

#269910

Table does a read and write that are the same div_time and Unit however the filled time changes . The Div_time will not equal the Filled_time . I need to find when this unit with the same Div_time had filled_times that don't match. I should see Machine 5 in my results.
Div_Time Unit_id Filled_time
1/1/2013 01:00 Machine5 1/1/2013 12:10
1/1/2013 01:00 Machine5 1/1/2013 12:15
1/1/2013 01:15 Machine7 1/1/2013 12:19
1/1/2013 01:15 Machine7 1/1/2013 12:19
Thanks
Sorry Machine7 is the same

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Sean Lange SSC Guru Points: 286573 More actions · Answer 1

You haven't received much response because your question is so vague. I think this may be what you are looking for.

Notice how I provided a table and sample data. This is something you should do in the future.

if object_id('tempdb..#Something') is not null

drop table #Something

create table #Something

(

Div_Time datetime,

Unit_id varchar(25),

Filled_time datetime

)

insert #Something

select '1/1/2013 01:00', 'Machine5', '1/1/2013 12:10' union all

select '1/1/2013 01:00', 'Machine5', '1/1/2013 12:15' union all

select '1/1/2013 01:15', 'Machine7', '1/1/2013 12:19' union all

select '1/1/2013 01:15', 'Machine7', '1/1/2013 12:19'

select distinct s1.Div_time, s1.Unit_id

from #Something s1

join #Something s2 on s1.Div_Time = s2.Div_Time and s1.Filled_time <> s2.Filled_time

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Steven Willis SSCrazy Eights Points: 9893 More actions · Answer 2

I made an assumption that you make two readings and two readings only on each machine. That assumption let's me join the table on itself and put the two readings on one line. [EDIT: Sean posted his response while I was working on mine. We had the same idea. The only difference is that I added more data such as the reading number and the actual time differences. But essentially the same query.]

SELECT

tt1.ID

,tt1.Mach_Name AS [MachineName]

,tt1.Div_Time AS [1stDivTime]

,tt1.Filled_Time AS [1stFilledTime]

,tt1.Diff1 AS [1stDuration]

,tt2.Div_Time AS [2ndDivTime]

,tt2.Filled_Time AS [2ndFilledTime]

,DATEDIFF(MINUTE,tt2.Div_Time,tt2.Filled_Time) AS [2ndDuration]

,DATEDIFF(MINUTE,tt2.Div_Time,tt2.Filled_Time)-tt1.Diff1 AS [Diff]

FROM

(

SELECT

*

,DATEDIFF(MINUTE,Div_Time,Filled_Time) AS [Diff1]

FROM

#TempTable

) AS tt1

INNER JOIN

#TempTable AS tt2

ON tt1.ID = tt2.ID-1

AND tt1.Reading = 1

AND DATEDIFF(MINUTE,tt2.Div_Time,tt2.Filled_Time)-tt1.Diff1 <> 0

Output:

ID MachineName 1stDivTime 1stFilledTime 1stDuration 2ndDivTime 2ndFilledTime 2ndDuration Diff

1 Machine5 2013-01-01 01:00:00.000 2013-01-01 12:10:00.000 670 2013-01-01 01:00:00.000 2013-01-01 12:15:00.000 675 5

7 Machine11 2013-01-01 01:45:00.000 2013-01-01 12:40:00.000 655 2013-01-01 01:45:00.000 2013-01-01 12:28:00.000 643 -12

Dwain Camps SSC Guru Points: 86908 More actions · Answer 3

How about something like this to avoid the self-join? Uses Sean's setup data.

SELECT Div_time, Unit_id

,TimeDifferenceMin=DATEDIFF(minute, MIN(Filled_Time), MAX(Filled_Time))

FROM #Something

GROUP BY Unit_id, Div_time

HAVING MAX(Filled_Time) <> MIN(Filled_Time)

Edit: Added the time difference.

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Gators SSC Enthusiast Points: 106 More actions · Answer 4

Thanks for All the help, I appreciate all the input. Helped greatly...

Thank You

Here is what i came up with however I had to create a tmp table and join back to get both records.

SELECT

Divice_time

, Unit

, COUNT(DISTINCT Fill_time) AS cnt

FROM

Table

GROUP BY

Divice_time

, Unit

HAVING

COUNT(DISTINCT Fill_time) > 1

Sean Lange SSC Guru Points: 286573 More actions · Answer 5

dwain.c (2/7/2013)
How about something like this to avoid the self-join? Uses Sean's setup data.
SELECT Div_time, Unit_id
,TimeDifferenceMin=DATEDIFF(minute, MIN(Filled_Time), MAX(Filled_Time))
FROM #Something
GROUP BY Unit_id, Div_time
HAVING MAX(Filled_Time) <> MIN(Filled_Time)
Edit: Added the time difference.

+1 Thanks Dwain, not sure why I didn't come up with it.