Help performing a count

AdamskiR

Hi Im pulling my hair out here trying to produce a count between dates. I have a form which is filled out online and the values put into a main table. One of the options to complete on the form is pulled from a look up table and you can select more than one option. These values go into another table with the reference number from the main referral to tie the 2 together. So i have: .: Look up therapy table :. DTID - int Therapy - varchar .: Therapy Table :. DTRID - int ReferralID - int DTID - int .: Main table :. ReferralID - int DateSubmitted - datetime plus various other columns. So i want to do a count on the amount of different therapys have been selected. I can get it to show ones that have been entered, but i want it to display 0 values to, which i cant seem to do. Any help would be great. Thanks :)

Kschuler

Why don't you give a sample of what data is in each table, and then the SQL statement that you have tried, and how/why it isn't working. Because it is very hard to understand what your question is from what you have given us. My best guess is to try somthing like this: SELECT therapy, count(*) FROM tblMain, tblTherapy, tblLookupTherapy WHERE tblMain.ReferralID=tblTherapy.ReferralID AND tblTherapy.DTID=tblLookupTherapy.DTID WHERE tblMain.DateSubmitted>4/24/2008 GROUP BY therapy

AdamskiR

Thanks for your reply. For example In the lookup table - DrugTherapy

DTID(int) DrugTherapy(varchar)
1 Drug1
2 Drug2
3 Drug3
4 Drug4

Drug referrals made - ReferralDrugTherapy

DTRID(int) ReferralID(int) DTID(int)
1 1 1
2 1 1
3 2 4
4 2 3
5 3 2
6 4 2
7 5 1

Main Table CardiacReferrals

ReferralID(int) Ward(int) Comments(varchar) DateSubmitted(datetime)
1 1 test 01/01/2008
2 2 test1 22/01/2008
3 3 test2 01/02/2008
4 1 test543 21/02/2008
5 2 test45 01/02/2008
6 3 testtgdf 25/02/2008
7 9 testgdf 05/03/2008
8 5 testggd 11/03/2008
9 6 testfg 12/03/2008
10 4 testgd 07/04/2008

I have tried the following which works if there is values for the record, but if there isnt nothing is diplayed, what i want is for it to display 0 still if there is nothing there: SELECT DrugTherapy.DrugTherapy, COUNT(ReferralDrugTherapy.DTID) AS Expr1 FROM DrugTherapy INNER JOIN ReferralDrugTherapy ON DrugTherapy.DTID = ReferralDrugTherapy.DTID INNER JOIN CardiacReferrals ON ReferralDrugTherapy.ReferralID = CardiacReferrals.ReferralID WHERE (CardiacReferrals.DateSubmitted BETWEEN @from AND @to) OR (CardiacReferrals.DateSubmitted IS NULL) GROUP BY DrugTherapy.DrugTherapy Any help much appreciated. :)

Blue_Boy

COUNT(isnull(ReferralDrugTherapy.DTID,0))

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AdamskiR

Thanks, but that hasn't worked either im afraid

Blue_Boy

As I undestand when the table ReferralDrugTherapy have not records you got null value and instead null you want to display zero (0)?

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AdamskiR

Yes, so for example, i want to enter 2 range dates in say 01/01/2008 - 01/05/2008 and then to pull back for example

Drug1 1
Drug2 3
Drug3 2
Drug4 5

At the moment if i put in a large date range it brings back the records because it has some, but if no record is found for say Drug3 it doesnt get pulled back i might get

Drug1 1
Drug4 5

But what i would like is

Drug1 1
Drug2 0
Drug3 0
Drug4 5

Blue_Boy

select DrugTherapy.dtid,DrugTherapy.drugtherapy, (select count (dtid) from ReferralDrugTherapy where dtid = DrugTherapy.dtid) from DrugTherapy

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AdamskiR

Im slightly confused now, did you mean to add that bit to replace the top like so? select DrugTherapy.dtid,DrugTherapy.drugtherapy, (select count (dtid) from ReferralDrugTherapy where dtid = DrugTherapy.dtid) from DrugTherapy INNER JOIN ReferralDrugTherapy ON DrugTherapy.DTID = ReferralDrugTherapy.DTID INNER JOIN CardiacReferrals ON ReferralDrugTherapy.ReferralID = CardiacReferrals.ReferralID WHERE (CardiacReferrals.DateSubmitted BETWEEN @from AND @to) OR (CardiacReferrals.DateSubmitted IS NULL) GROUP BY DrugTherapy.DrugTherapy Or something else? That query alone works, but how would i enter my date ranges still? Many thanks :)

Kschuler

How about if you try to make that first join an outer join, like this: SELECT DrugTherapy.DrugTherapy, COUNT(ReferralDrugTherapy.DTID) AS Expr1 FROM DrugTherapy LEFT OUTER JOIN ReferralDrugTherapy ON DrugTherapy.DTID = ReferralDrugTherapy.DTID INNER JOIN CardiacReferrals ON ReferralDrugTherapy.ReferralID = CardiacReferrals.ReferralID WHERE (CardiacReferrals.DateSubmitted BETWEEN @from AND @to) OR (CardiacReferrals.DateSubmitted IS NULL) GROUP BY DrugTherapy.DrugTherapy An inner join will join two tables together and return only the records where they match in the "ON" portion. A left outer join will join two tables and return the records where they match in the "ON" portion but will also return any records that didn't match in the table on the left of the "LEFT OUTER JOIN" statement. Be aware that this may bring back null values for fields that you reference in the table on the right side of the join. If you want to do some more research on this, I'd suggest searching for the keywords "OUTER JOIN SQL" on google. Hope this helps.

AdamskiR

That source didnt do the trick either :sigh: Ive been searching on this but not to much luck, theres plenty on joining the 2 tables but 3 isnt particularly good :confused:

Kschuler

I think I should have put a LEFT OUTER JOIN for both of the joins in your statement. Try that and see if it gets you anywhere.

Blue_Boy

I think I got it (just change date values in according to your format string, instead yyyy-MM-dd set your format) SELECT CASE WHEN dbo.ReferralDrugTherapy.DTID IS NULL THEN (SELECT TOP 1 t1.DTID FROM DrugTherapy AS t1 WHERE t1.DrugTherapy IN (dbo.DrugTherapy.DrugTherapy)) ELSE dbo.ReferralDrugTherapy.DTID END AS dtid, dbo.DrugTherapy.DrugTherapy, COUNT(dbo.ReferralDrugTherapy.DTID) AS numbers FROM dbo.ReferralDrugTherapy FULL OUTER JOIN dbo.DrugTherapy ON dbo.ReferralDrugTherapy.DTID = dbo.DrugTherapy.DTID left outer join CardiacReferrals on dbo.ReferralDrugTherapy.referralid = CardiacReferrals.referralid and CardiacReferrals.datesubmitted between '2008-01-01' and '2008-02-21' GROUP BY dbo.ReferralDrugTherapy.DTID, dbo.DrugTherapy.DrugTherapy, dbo.DrugTherapy.DTID

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AdamskiR

Not quite, it doesnt seem to matter what date range you put it, it always pulls back all the results for each drug type. I tried changing it slightly so the dates in a where to SELECT CASE WHEN dbo.ReferralDrugTherapy.DTID IS NULL THEN (SELECT TOP 1 t1.DTID FROM DrugTherapy AS t1 WHERE t1.DrugTherapy IN (dbo.DrugTherapy.DrugTherapy)) ELSE dbo.ReferralDrugTherapy.DTID END AS dtid, DrugTherapy.DrugTherapy, COUNT(ReferralDrugTherapy.DTID) AS numbers FROM ReferralDrugTherapy FULL OUTER JOIN DrugTherapy ON ReferralDrugTherapy.DTID = DrugTherapy.DTID LEFT OUTER JOIN CardiacReferrals ON ReferralDrugTherapy.ReferralID = CardiacReferrals.ReferralID WHERE (CardiacReferrals.DateSubmitted BETWEEN @from AND @to) GROUP BY ReferralDrugTherapy.DTID, DrugTherapy.DrugTherapy, DrugTherapy.DTID but all that did was give me the same problem where if it doesnt find anything it brings back nothing instead of 0 values. Argh! :wtf:

Blue_Boy

write date values which you are giving?

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AdamskiR

Well say if i put in 01/01/2008 - 01/05/2008 it pulls back records as there are ones within that range. (But also will not display those that dont have anything as 0, just wont display) But say i put in 01/05/2008 - 02/05/2008 then it pulls back nothing

Blue_Boy

between dates 01/05/2008 - 02/05/2008 you need this result : DTID DrugTherapy CountNumbers 2 Drug2 0 3 Drug3 0 1 Drug1 5 4 Drug4 1

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AdamskiR

Yes, so if there is none made, it to display a 0 so i can display reports on a page. Thanks

Blue_Boy

change date format to dd/MM/yyyy from regoinal Settings on control panel, then on date parameters ad values like this '01/01/2008' - '02/01/2008' by that changes,query works perfeclty for me here it is SELECT CASE WHEN dbo.ReferralDrugTherapy.DTID IS NULL THEN (SELECT TOP 1 t1.DTID FROM DrugTherapy AS t1 WHERE t1.DrugTherapy IN (dbo.DrugTherapy.DrugTherapy)) ELSE dbo.ReferralDrugTherapy.DTID END AS dtid, dbo.DrugTherapy.DrugTherapy, COUNT(dbo.ReferralDrugTherapy.DTID) AS numbers FROM dbo.ReferralDrugTherapy FULL OUTER JOIN dbo.DrugTherapy ON dbo.ReferralDrugTherapy.DTID = dbo.DrugTherapy.DTID left outer join CardiacReferrals on dbo.ReferralDrugTherapy.referralid = CardiacReferrals.referralid and CardiacReferrals.datesubmitted between '01/01/2008' and '01/05/2008' GROUP BY dbo.ReferralDrugTherapy.DTID, dbo.DrugTherapy.DrugTherapy, dbo.DrugTherapy.DTID

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AdamskiR

My date settings are already set to that. The query that you have given me also just gives the total made, no matter what dates you enter you always get the total, it doesnt calculate any differences. Thanks for your help so far!