union 3 table 然后我想将空值显示为 'X'

Question

我有3个table那个联合，这是sql代码

SELECT * FROM
(SELECT DISTINCT userid, status , DATEPART(dd, [date]) as Date
FROM edrsDB..tbl_status
WHERE DATEPART(MM, [date]) = 3
And DATEPART(YYYY, [date]) = 2017
Union 
SELECT DISTINCT userid, status , DATEPART(DD,[date]) as Date
FROM edrsDB..tbl_public_holiday
WHERE DATEPART(MM, [date]) = 3
And DATEPART(YYYY, [date]) = 2017
Union
SELECT DISTINCT userid, status , DATEPART(DD,[Date]) as Date 
FROM edrsDB..tbl_station_weekend
WHERE DATEPART(MM, [date]) = 3
And DATEPART(YYYY, [date]) = 2017
And date IS NOT NULL) AS monthlyRpt
PIVOT (MAX(status)
FOR userid IN (XSP, BSR, BPT, XPW, IPH, XTH, TGG, XKG, XKM, XLG, KBR, KUA, LGK,MKZ, PEN, XGM, JHB, XBN, STW, TIN, MUA)) AS pivottable

在我运行这个 sql 查询之后我得到了很多空值...所以我希望空值显示为 'X'

任何人都可以提出建议

这是结果

null result after union

Answer 1

请尝试

select
    Date,
    isnull(XSP, 'X') as XSP,
    isnull(BSR, 'X') as BSR,
    isnull(BPT, 'X') as BPT,
    isnull(XPW, 'X') as XPW,
    isnull(IPH, 'X') as IPH,
    isnull(XTH, 'X') as XTH,
    isnull(TGG, 'X') as TGG,
    isnull(XKG, 'X') as XKG,
    isnull(XKM, 'X') as XKM,
    isnull(XLG, 'X') as XLG,
    isnull(KBR, 'X') as KBR,
    isnull(KUA, 'X') as KUA,
    isnull(LGK, 'X') as LGK,
    isnull(MKZ, 'X') as MKZ,
    isnull(PEN, 'X') as PEN,
    isnull(XGM, 'X') as XGM,
    isnull(JHB, 'X') as JHB,
    isnull(XBN, 'X') as XBN,
    isnull(STW, 'X') as STW,
    isnull(TIN, 'X') as TIN,
    isnull(MUA, 'X') as MUA
FROM
(
    SELECT DISTINCT userid, status , DATEPART(dd, [date]) as Date
    FROM edrsDB..tbl_status
    WHERE DATEPART(MM, [date]) = 3
    And DATEPART(YYYY, [date]) = 2017
    Union 
    SELECT DISTINCT userid, status , DATEPART(DD,[date]) as Date
    FROM edrsDB..tbl_public_holiday
    WHERE DATEPART(MM, [date]) = 3
    And DATEPART(YYYY, [date]) = 2017
    Union
    SELECT DISTINCT userid, status , DATEPART(DD,[Date]) as Date 
    FROM edrsDB..tbl_station_weekend
    WHERE DATEPART(MM, [date]) = 3
    And DATEPART(YYYY, [date]) = 2017
    And date IS NOT NULL
) AS monthlyRpt
PIVOT (MAX(status)
    FOR userid IN (XSP, BSR, BPT, XPW, IPH, XTH, TGG, XKG, XKM, XLG, KBR, KUA, LGK,MKZ, PEN, XGM, JHB, XBN, STW, TIN, MUA)
) AS pivottable

union 3 table 然后我想将空值显示为 'X'

union 3 table and then i want to display null values as 'X'

sql

database

isnull

sql-server-2008