每一天的好日子
我有这个代码
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)))
并且它工作正常，问题是当Select语句没有检索到任何行时它们变为空而不是替换零
而不是用0 0 0生成单词month它只是弹出我不喜欢的空白，
你可以帮我解决这个问题吗？结果应该是这样的------------------------------------------------------------------
MONTH | Count | Grams | Principal |
October |123123 | 123123 | 123123213 |
November | 0 | 0 | 0 | // this should appear if no rows where selected instead of blank
这是我在temptables中生成项目的代码
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)
我希望你能帮助我，因为我只是sql的首发
我尝试使用is NULL就像你上面看到的那样，但我不知道我是否正确实现了
希望你的善意和考虑，谢谢你:)。
****编辑**
临时表不包含任何值，我只想输出0而不是空白。
答案 0 :(得分：2)
编辑：添加了一个月表来处理空的临时表。
将内部联接更改为左联接。
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
答案 1 :(得分：1)
在您的选择中尝试此操作
SELECT (CASE WHEN (AE.fld_LoanDate IS null) THEN 0 ELSE AE.fld_LoanDate END) as fld_LoanDate
答案 2 :(得分：0)
尽管这两个答案都符合提问者的要求，但我会建议'在（范围）'，“分组依据”，以及左连接和日期范围内的LoanDate。
所以，你有这样的表：
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
);
这几乎就是我的建议（我没有笔记本电脑，所以现在没有mysql），
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);