Dynamic dates Pivot

Question

Sample Data from StartKPA table:

I wrote the following query:

SELECT      *
FROM    
(
            SELECT BookInventoryDate, EndKpa,CASE WHEN (EndKPA*100)>80 THEN '>80' WHEN (EndKPA*100) BETWEEN 70 AND 80 THEN '70-80'
                                              WHEN (EndKPA*100) BETWEEN 65 AND 70 THEN '65-70'
                                              WHEN (EndKPA*100) BETWEEN 62 AND 65 THEN '62-65'
                                              WHEN (EndKPA*100) BETWEEN 60 AND 62 THEN '60-62'
                                              ELSE '<60' END as Aantallen
FROM        StartKPA
WHERE       BookInventoryDate > '20180429'
)           as Aantallen
PIVOT
(
    COUNT(EndKpa)
    FOR [BookInventoryDate] IN ([20180430], [20180501], [20180502])
) AS pvt
ORDER BY Aantallen DESC

With the following results (Sorry couldn't get in in a table here):

The problem is that I want dynamic dates. So every day a new date will be added, and the 20180502 isn't showed because there is no data. So I want the results in the above table, but everyday a new day will be added (and no zero results like above). I don't want to add a new date every day manually to the query.

There are some posts about it already, but I couldn't get it to work:

DECLARE @cols AS NVARCHAR(MAX),
@query  AS NVARCHAR(MAX)

;with cte (datelist, maxdate) as
(
select min(BookInventoryDate) datelist, max(BookinventoryDate) maxdate
from StartKPA
union all
select dateadd(dd, 1, datelist), maxdate
from cte
where datelist < maxdate
) 
select c.datelist
into #tempDates
from cte c

select @cols = STUFF((SELECT distinct ',' + QUOTENAME(convert(CHAR(10), 
datelist, 120)) 
                from #tempDates
        FOR XML PATH(''), TYPE
        ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'')

set @query = 'SELECT Aantallen, BookinventoryDate, ' + @cols + ' from 
         (
           SELECT BookInventoryDate, EndKpa,CASE WHEN (EndKPA*100)>80 THEN '>80' WHEN (EndKPA*100) BETWEEN 70 AND 80 THEN '70-80'
                                              WHEN (EndKPA*100) BETWEEN 65 AND 70 THEN '65-70'
                                              WHEN (EndKPA*100) BETWEEN 62 AND 65 THEN '62-65'
                                              WHEN (EndKPA*100) BETWEEN 60 AND 62 THEN '60-62'
                                              ELSE '<60' END as Aantallen
            FROM        #tempDates d
            LEFT JOIN   StartKPA kpa on d.datelist=kpa.bookinventorydate
            WHERE       BookInventoryDate > '20180429'
        ) x
        pivot 
        (
            count(EndKpa)
            for PivotDate in (' + @cols + ')
        ) p '

execute(@query)

I got a few error messages, tried to change things but I don't understand it enough to get it working.

Can someone help? Thanks!

Answer 1

Try this query. I was not able to check the query since I don't have data. If there is an error, please let me know.

SELECT DISTINCT BookInventoryDate FROM StartKPA

DECLARE @colsValues AS NVARCHAR(max) = Stuff((SELECT DISTINCT ',' + Quotename(datesYouWantAsColumns)
         FROM yourTable
         FOR xml path(''), type).value('.', 'NVARCHAR(MAX)'), 1, 1, ''); 

I'm getting unique dates assuming StartKPA is a table and BookInventoryDate is a field of that table. If'I'm wrong, please change it.

DECLARE @colsValues AS NVARCHAR(max) = Stuff((SELECT DISTINCT ',' + Quotename(BookInventoryDate)
         FROM StartKPA
         FOR xml path(''), type).value('.', 'NVARCHAR(MAX)'), 1, 1, ''); 

DECLARE @query AS NVARCHAR(max);

SET @query =   'SELECT      *
                FROM    
                (
                            SELECT BookInventoryDate, EndKpa,CASE WHEN (EndKPA*100)>80 THEN ''>80'' WHEN (EndKPA*100) BETWEEN 70 AND 80 THEN ''70-80''
                                                                WHEN (EndKPA*100) BETWEEN 65 AND 70 THEN ''65-70''
                                                                WHEN (EndKPA*100) BETWEEN 62 AND 65 THEN ''62-65''
                                                                WHEN (EndKPA*100) BETWEEN 60 AND 62 THEN ''60-62''
                                                                ELSE ''<60'' END as Aantallen
                FROM        StartKPA
                WHERE       BookInventoryDate > ''20180429''
                )           as Aantallen
                PIVOT
                (
                    COUNT(EndKpa)
                    FOR [BookInventoryDate] IN ('+ @colsValues +')
                ) AS pvt
                ORDER BY Aantallen DESC';

EXECUTE(@query); 

Answer 2

You should change single quotes 'inside your @query by double single quotes ''.

Keep in mind you're using a recursive query, you must set a correct value for:

OPTION (MAXRECURSION XXXX)

create table StartKPA(BookInventoryDate datetime);
insert into StartKPA values ('20180101'), ('20180108');
GO

2 rows affected

DECLARE @cols AS NVARCHAR(MAX),
@query  AS NVARCHAR(MAX)

;with cte (datelist, maxdate) as
(
select min(BookInventoryDate) datelist, max(BookinventoryDate) maxdate
from StartKPA
union all
select dateadd(dd, 1, datelist), maxdate
from cte
where datelist < maxdate
) 
select c.datelist
into #tempDates
from cte c
option (maxrecursion 0);

select @cols = STUFF((SELECT distinct ',' + QUOTENAME(convert(CHAR(10), 
datelist, 120)) 
                from #tempDates
        FOR XML PATH(''), TYPE
        ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'')

set @query = 'SELECT Aantallen, BookinventoryDate, ' + @cols + ' from 
         (
           SELECT BookInventoryDate, EndKpa,CASE WHEN (EndKPA*100)>80 THEN ''>80'' WHEN (EndKPA*100) BETWEEN 70 AND 80 THEN ''70-80''
                                              WHEN (EndKPA*100) BETWEEN 65 AND 70 THEN ''65-70''
                                              WHEN (EndKPA*100) BETWEEN 62 AND 65 THEN ''62-65''
                                              WHEN (EndKPA*100) BETWEEN 60 AND 62 THEN ''60-62''
                                              ELSE ''<60'' END as Aantallen
            FROM        #tempDates d
            LEFT JOIN   StartKPA kpa on d.datelist=kpa.bookinventorydate
            WHERE       BookInventoryDate > ''20180429''
        ) x
        pivot 
        (
            count(EndKpa)
            for PivotDate in (' + @cols + ')
        ) p '

select @query;
GO

SELECT Aantallen, BookinventoryDate, [2018-01-01],[2018-01-02],[2018-01-03],[2018-01-04],[2018-01-05],[2018-01-06],[2018-01-07],[2018-01-08] from 
         (
           SELECT BookInventoryDate, EndKpa,CASE WHEN (EndKPA*100)>80 THEN '>80' WHEN (EndKPA*100) BETWEEN 70 AND 80 THEN '70-80'
                                              WHEN (EndKPA*100) BETWEEN 65 AND 70 THEN '65-70'
                                              WHEN (EndKPA*100) BETWEEN 62 AND 65 THEN '62-65'
                                              WHEN (EndKPA*100) BETWEEN 60 AND 62 THEN '60-62'
                                              ELSE '<60' END as Aantallen
            FROM        #tempDates d
            LEFT JOIN   StartKPA kpa on d.datelist=kpa.bookinventorydate
            WHERE       BookInventoryDate > '20180429'
        ) x
        pivot 
        (
            count(EndKpa)
            for PivotDate in ([2018-01-01],[2018-01-02],[2018-01-03],[2018-01-04],[2018-01-05],[2018-01-06],[2018-01-07],[2018-01-08])
        ) p 

db<>fiddle here