Generate Zeroes when no rows where selected - sql

Question

Good Day Every one
i have this code
SELECT
'Expired Item -'+ DateName(mm,DATEADD(MM,4,AE.LOAN)) as [Month]
,COUNT(ISNULL(PIT.ID,0))'COUNT'
,SUM(ISNULL(PIT.KGRAM,0))'GRAMS'
,SUM(ISNULL(PH.AMOUNT,0))'PRINCIPAL'
FROM #AllExpired AE
INNER JOIN Transactions.ITEM PIT
ON AE.MAINID=PIT.MAINID
INNER JOIN Transactions.HISTO PH
ON AE.MAINID=PH.MAINID
GROUP BY DATENAME(MM,(DATEADD(MM,4,AE.LOAN)))
UNION ALL
/*SELECT EXPIRED AFTER 5 MONTHS*/
SELECT
'Expired Item -'+ DateName(mm,DATEADD(MM,5,AE.LOAN)) as [Month]
,COUNT(ISNULL(PIT.ID,0))'COUNT'
,SUM(ISNULL(PIT.KGRAM,0))'GRAMS'
,SUM(ISNULL(PH.AMOUNT,0))'PRINCIPAL'
FROM #ExpAfterFiveMonths E5
INNER JOIN Transactions.ITEM PIT
ON E5.MAINID=PIT.MAINID
INNER JOIN Transactions.HISTO PH
ON E5.MAINID=PH.MAINID
INNER JOIN #AllExpired AE
ON AE.MAINID=E5.MAINID
GROUP BY DATENAME(MM,(DATEADD(MM,5,AE.LOAN)))
UNION ALL
/*SELECT EXPIRED AFTER 6 MONTHS*/
SELECT
'Expired Item -'+ DateName(mm,DATEADD(MM,6,AE.LOAN)) as [Month]
,COUNT(ISNULL(PIT.ID,0))'COUNT'
,SUM(ISNULL(PIT.KGRAM,0))'GRAMS'
,SUM(ISNULL(PH.AMOUNT,0))'PRINCIPAL'
FROM #ExpAfterSixMonths E6
INNER JOIN Transactions.ITEM PIT
ON E6.MAINID=PIT.MAINID
INNER JOIN Transactions.HISTO PH
ON E6.MAINID=PH.MAINID
INNER JOIN #AllExpired AE
ON AE.MAINID=E6.MAINID
GROUP BY DATENAME(MM,(DATEADD(MM,6,AE.LOAN)))
and it works fine, the problem is that when the Select statements retrieved no rows they become empty instead of replacing zeroes
instead of Generating the word month with 0 0 0 it just pops out empty in which i dont like,,
can you help me achive that? the result should be something like this
------------------------------------------------------------------
MONTH | Count | Grams | Principal |
October |123123 | 123123 | 123123213 |
November | 0 | 0 | 0 | // this should appear if no rows where selected instead of blank
here is my code to generate the items inside temptables
SELECT TE.MAINID
,TE.EXPIRY
,TE.LOAN
,PM.STORAGE
into #AllExpiredAfterFiveAndSix
FROM #ExpiredAfterFiveandSixMon TE
inner join Transactions.TABLEMAIN PM
on TE.MAINID = PM.MAINID
inner join #AllExpired E4
on E4.MAINID=TE.MAINID
WHERE ((cast(TE.EXPIRY as date) < cast(TE.newloandate as date))
OR(TE.NewLoanDate is null and ((cast(TE.EXPIRY as date) < cast(PM.DATERED as date)) or PM.STATUS = 7 or PM.STATUS = 5)) )
AND (PM.STORAGE BETWEEN 3 AND 14 OR PM.STORAGE=17)
/*EXPIRED AFTER 5 MONTHS*/
select AE.MAINID
,AE.LOAN
,AE.STORAGE
,ae.EXPIRY
into #ExpAfterFiveMonths
from #AllExpiredAfterFiveAndSix AE
inner join #AllExpired E4
on E4.MAINID=AE.MAINID
where MONTH(AE.EXPIRY)= MONTH(dateadd(mm,1,E4.EXPIRY))
/*EXPIRED AFTER 6 MONTHS*/
select AE.MAINID
,AE.LOAN
,AE.STORAGE
,ae.EXPIRY
into #ExpAfterSixMonths
from #AllExpiredAfterFiveAndSix AE
inner join #AllExpired E4
on E4.MAINID=AE.MAINID
where MONTH(AE.EXPIRY)= MONTH(dateadd(mm,2,E4.EXPIRY))
CREATE NONCLUSTERED INDEX IDX_ExpAfterFiveMonths ON #ExpAfterFiveMonths(MAINID)
CREATE NONCLUSTERED INDEX IDX_ExpAfterSixMonths ON #ExpAfterSixMonths(MAINID)
i hope you can help me because im just a starter in sql
i have tried using is NULL as what you have seen above but i do not know if i implement it correctly
Hoping for your Kindness and consideration thank you :)
****EDIT**
The temp tables contains no values to start with, i just want it to output 0 instead of blank.

Answer 1

Edited: Added a months table to handle empty temp tables.
Change inner joins to left joins.
DECLARE #months TABLE (ReportMonth VARCHAR(20) NOT NULL)
INSERT INTO #months VALUES
('January'),('February'),('March'),('April'),
('May'),('June'),('July'),('August'),
('September'),('October'),('November'),('December')
SELECT
'Expired Item -'+ COALESCE(DateName(mm,DATEADD(MM,4,AE.fld_LoanDate)), M.ReportMonth) as [Month]
,COUNT(ISNULL(PIT.fld_PawnItemID,0))'COUNT'
,SUM(ISNULL(PIT.fld_KaratGram,0))'GRAMS'
,SUM(ISNULL(PH.fld_PrincipalAmt,0))'PRINCIPAL'
FROM
#months M
LEFT JOIN #AllExpired AE
ON M.ReportMonth = DateName(mm,DATEADD(MM,4,AE.fld_LoanDate))
LEFT JOIN Transactions.tbl_PawnItem PIT
ON AE.fld_PawnMainID=PIT.fld_PawnMainID
LEFT JOIN Transactions.tbl_PawnHisto PH
ON AE.fld_PawnMainID=PH.fld_PawnMainID
GROUP BY M.ReportMonth
UNION ALL
/*SELECT EXPIRED AFTER 5 MONTHS*/
SELECT
'Expired Item -'+ 'Expired Item -'+ COALESCE(DateName(mm,DATEADD(MM,5,AE.fld_LoanDate)), M.ReportMonth) as [Month]
,COUNT(ISNULL(PIT.fld_PawnItemID,0))'COUNT'
,SUM(ISNULL(PIT.fld_KaratGram,0))'GRAMS'
,SUM(ISNULL(PH.fld_PrincipalAmt,0))'PRINCIPAL'
FROM
#months M
LEFT JOIN #AllExpired AE
ON M.ReportMonth = DateName(mm,DATEADD(MM,5,AE.fld_LoanDate))
LEFT JOIN #ExpAfterFiveMonths E5
ON AE.fld_PawnMainID=E5.fld_PawnMainID
LEFT JOIN Transactions.tbl_PawnItem PIT
ON E5.fld_PawnMainID=PIT.fld_PawnMainID
LEFT JOIN Transactions.tbl_PawnHisto PH
ON E5.fld_PawnMainID=PH.fld_PawnMainID
GROUP BY M.ReportMonth
UNION ALL
/*SELECT EXPIRED AFTER 6 MONTHS*/
SELECT
'Expired Item -'+ COALESCE(DateName(mm,DATEADD(MM,6,AE.fld_LoanDate)), M.ReportMonth) as [Month]
,COUNT(ISNULL(PIT.fld_PawnItemID,0))'COUNT'
,SUM(ISNULL(PIT.fld_KaratGram,0))'GRAMS'
,SUM(ISNULL(PH.fld_PrincipalAmt,0))'PRINCIPAL'
FROM
#months M
LEFT JOIN #AllExpired AE
ON M.ReportMonth = DateName(mm,DATEADD(MM,6,AE.fld_LoanDate))
LEFT JOIN #ExpAfterSixMonths E6
ON AE.fld_PawnMainID=E6.fld_PawnMainID
LEFT JOIN Transactions.tbl_PawnItem PIT
ON E6.fld_PawnMainID=PIT.fld_PawnMainID
LEFT JOIN Transactions.tbl_PawnHisto PH
ON E6.fld_PawnMainID=PH.fld_PawnMainID
GROUP BY M.ReportMonth

Answer 2

Try this in your select
SELECT (CASE WHEN (AE.fld_LoanDate IS null) THEN 0 ELSE AE.fld_LoanDate END) as fld_LoanDate

Answer 3

Though both answers do what the questioner wanted, I though I would suggest 'where LoanDate in (range)', 'group by', along with left join, and a date range.
So, you have tables like this:
CREATE TABLE tPawnItem
(
fPawnItemID int auto_increment primary key,
fDescription varchar(30),
fKaratGram float
);
CREATE TABLE tPawnHisto
(
fPawnMainID int primary key,
fPrincipalAmt int,
fRedeemed date
);
create table tExp
(
fPawnMainID int primary key,
fLoanDate date
);
This is proximately what I'm suggesting (I don't have my laptop, so no mysql right now),
SELECT
'Expired Item -'+ DATENAME(MM,tExp.fLoanDate) as [Month]
,COUNT(ISNULL(tPawnItem.fPawnItemID,0))'COUNT'
,SUM(ISNULL(tPawnItem.fKaratGram,0))'GRAMS'
,SUM(ISNULL(tPawnHisto.fPrincipalAmt,0))'PRINCIPAL'
FROM tExp
INNER JOIN tPawnItem
ON tExp.fPawnMainID=tPawnItem.fPawnMainID
INNER JOIN tPawnHisto
ON tExp.fPawnMainID=tPawnHisto.fPawnMainID
WHERE t.Exp.fLoanDate in (
DATENAME(MM,DATEADD(MM,4,tExp.fLoanDate)),
DATENAME(MM,DATEADD(MM,5,tExp.fLoanDate)),
DATENAME(MM,DATEADD(MM,6,tExp.fLoanDate)),
DATENAME(MM,DATEADD(MM,7,tExp.fLoanDate))
)
GROUP BY DATENAME(MM,tExp.fLoanDate);