Question

SQL SUM to control DataList item display

Asked by: John0214

ASP.NET, VB, MS SQL Server

I have a DataList that displays available training sessions to our clients. Each training session is made up of 5 different modules. Each module has a limit of 12 attendees, for a potential 60 attendees for a particular training session.  Once we reach the limit of 60 attendees, we want the particular training session to NOT appear in the DataList.  The other consideration is an expiration date for each training session, which is working fine. I only mention it because it is part of the code I have submitted below.

I have three SQL tables: one for the training location information (mutliple locations), one for the actual training sessions, and another for attendee/registrant information.

When a person clicks on the training session listed in the DataList, it brings them to a detailed page where they can select the individual training modules for that training session. When the person registers, a value of either '0' (not selected) or '1' (selected) is inserted for the particular training modules in the registrant database table. In addition, the training session's sessionID is inserted into a table column as well.

What I'm trying to do:
When the page loads, I want the DataList to SUM the 5 different modules per sessionID saved in the registrant database (which may be Null if nobody has registered for any modules within a training session). If the SUM of all 5 modules associated with the same sessionID is equal or greater than 60, don't display the training session.

Code below. Note the variables productID, trainingID and expDate are select parameters.

Thank you for any assistance or insight - I need the help and am not sure this approach is the best one.

SELECT ts.productID, ts.trainingCatID, ts.sessionStartDate, ts.officeID, ts.sessionID,  ts.sessionEndDate, tl.officeCity, tl.OfficeState, isNull(SUM(tr.module1), 0) + isNull(SUM(tr.module2), 0) + isNull(SUM(tr.module3), 0) +isNull(SUM(tr.module4), 0) + isNull(SUM(tr.module5), 0) As WeekTotal
 
FROM TrainingLocations tl, TrainingSessions ts LEFT JOIN TrainingRegistrants tr ON ts.sessionID = tr.sessionID
 
WHERE (ts.productid = @productID AND ts.trainingID = @trainingID AND ts.officeID = tl.officeID AND expDate > @expDate AND WeekTotal < 60)
 
GROUP BY ts.productID, ts.sessionID, ts.trainingCatID, ts.sessionStartDate, ts.sessionEndDate, ts.officeID, tl.officeCity, tl.officeState, tr.module1, tr.module2, tr.module3, tr.module4, tr.module5

                                  
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Asked On
2009-11-04 at 13:11:48ID24872541
Tags

ASP.NET

,

VB

,

MS SQL Server

,

DataList

,

SUM

Topics

Programming for ASP.NET

,

SQL Query Syntax

,

VB Script

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: samtran0331Posted on 2009-11-04 at 14:02:31ID: 25744467

Try adding the below to the end of your query...which should show only rows where the total is less than 60

HAVING
 (ISNULL(SUM(tr.module1), 0) + ISNULL(SUM(tr.module2), 0) + ISNULL(SUM(tr.module3), 0) 
       + ISNULL(SUM(tr.module4), 0) + ISNULL(SUM(tr.module5), 0)) < 60
                                              
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by: HainKurtPosted on 2009-11-04 at 17:29:58ID: 25745983

first of all is this correct?

you are grouping

 GROUP BY ts.productID, ts.sessionID, ts.trainingCatID, ts.sessionStartDate, ts.sessionEndDate, ts.officeID, tl.officeCity, tl.officeState, tr.module1, tr.module2, tr.module3, tr.module4, tr.module5

but not selecting all (actually, you should group if you use them in select)
anyway...

say your query is q, and you can use this...

select * from (q) x where x.WeekTotal < 60
                                              
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by: samtran0331Posted on 2009-11-05 at 04:37:52ID: 25748765

oh and if you use my "having" suggestion, remove the " AND WeekTotal < 60" from your where clause

 

by: John0214Posted on 2009-11-05 at 06:05:13ID: 25749516

samtran0331, thanks for your suggestion - I was playing with the HAVING clause earlier, but was getting some strange results (or maybe it's just my code that's strange). I've modified my code as you suggested, but am still getting strange results.

Instead of getting one item returned for each training session in the DataList (so that all available training sessions are listed), I'm receiving multiple items for the same training session (almost like it's repeating), but it's only occurring for those training sessions that have registrants. If there are no registrants, then the training session is listed once, as it should be.

Here is what the training registrant table COULD look like. So, for example, I need to find the sum of all modules (1-5) related to all records with the same sessionID. So here, sessionID 28 would have 7 registrants so far, sessionID 37 would have 2 registrants so far, and sessionID 40 would have 9 registrants so far (hopefully this table is formatted correctly once I submit this post).

ID     sessionID          module1     module2     module3     module4     module5
__________________________________________________________
1             28                 0                 0                1                 1                 0
2             28                 1                 1                1                 1                 1
3             37                 1                 1                0                 0                 0
4             40                 1                 1                1                 0                 0
5             40                 0                 0                0                 0                 1
6             40                 1                 1                1                 1                 1

The current modified code is below. THANK YOU for helping me figure this out.

SELECT ts.productID, ts.trainingCatID, ts.sessionStartDate, ts.officeID, ts.sessionID, ts.sessionEndDate, tl.officeCity, tl.OfficeState, isNull(SUM(tr.module1), 0) + isNull(SUM(tr.module2), 0) + isNull(SUM(tr.module3), 0) +isNull(SUM(tr.module4), 0) + isNull(SUM(tr.module5), 0) As WeekTotal
 
FROM TrainingLocations tl, TrainingSessions ts LEFT JOIN TrainingRegistrants tr ON ts.sessionID = tr.sessionID
 
WHERE (ts.productid = @productID AND ts.trainingID = @trainingID AND ts.officeID = tl.officeID AND expDate > @expDate)
 
GROUP BY ts.productID, ts.trainingCatID, ts.sessionStartDate, ts.officeID, ts.sessionID, ts.sessionEndDate, tl.officeCity, tl.officeState, tr.module1, tr.module2, tr.module3, tr.module4, tr.module5 
HAVING (ISNULL(SUM(tr.module1), 0) + ISNULL(SUM(tr.module2), 0) + ISNULL(SUM(tr.module3), 0) + ISNULL(SUM(tr.module4), 0) + ISNULL(SUM(tr.module5), 0)) < 60

                                              
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by: samtran0331Posted on 2009-11-05 at 06:43:07ID: 25749900

Bear with me John0214...it's a bit difficult to fully understand what you need without being able to test with your db myself... but you said:

>>(almost like it's repeating)

Usually when that happens with an aggregate query, it's because there's too many fields in the GROUP BY

Just taking a guess...but try removing the below from your GROUP BY:

, tr.module1, tr.module2, tr.module3, tr.module4, tr.module5

(you shouldn't need to group them if you're summing them)

 

by: John0214Posted on 2009-11-05 at 07:34:34ID: 25750550

samtran0331, thanks for the tip regarding grouping the summed fields - I removed them from the GROUP BY and it eliminated the repeating. During some brief testing, everything seems to be working GREAT now, Thank you so much for your assistance, you saved me quite a bit of time and frustration. Very much appreciated - thanks again!

20120131-EE-VQP-002

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