PIVOT-query op verschillende records

Als je een ROW_NUMBER() aan de mix toevoegt, kan je pivot de associatie tussen activiteiten en percentages behouden.

;with cte as 
(
    select *, ROW_NUMBER() over (partition by name order by percentage desc) ROWNUM
    from A
),
cte2 as
(
    SELECT Id,Code,ROWNUM,James,James_,Sam,Sam_,Lisa,Lisa_
    FROM cte
    PIVOT(MAX(activity)
          FOR name IN (James,Sam,Lisa)) AS PVTTable PIVOT
          (
          MAX(percentage)
          FOR name1 IN (James_,Sam_,Lisa_)) AS PVTTable1
)
select Id, Code, MAX(James) James, MAX(James_) James_, MAX(Sam) Sam, MAX(Sam_) Sam_, MAX(Lisa) Lisa, MAX(Lisa_) Lisa_
from cte2
group by Id, Code, ROWNUM

Retourneren:

Id  Code        James       James_  Sam         Sam_    Lisa    Lisa_
1   Prashant    Running     43.43   Cooking 1   73      Walking 90.34
1   Prashant    Stealing    0.00    Cooking     3.43    NULL    NULL
1   Prashant    Lacking     0.00    NULL        NULL    NULL    NULL

Het idee is dat je in de eerste algemene tabeluitdrukking de A-tabel naar dit transformeert:

Id  Code        percentage  name    name1   activity    ROWNUM
1   Prashant    43.43       James   James_  Running     1
1   Prashant    0.00        James   James_  Stealing    2
1   Prashant    0.00        James   James_  Lacking     3
1   Prashant    90.34       Lisa    Lisa_   Walking     1
1   Prashant    73          Sam     Sam_    Cooking 1   1
1   Prashant    3.43        Sam     Sam_    Cooking     2

En tijdens de resterende zoekopdracht fungeert de ROWNUM-kolom alleen om de procentuele waarde aan de activiteit te binden.

Het dynamisch maken is eenvoudig als je eenmaal een werkende query hebt. Vervang gewoon alle dynamische delen (in dit geval door komma's gescheiden lijsten met namen, toch?) Met variabelen. Zoiets als dit:

declare @sql nvarchar(max)
declare @name_concat nvarchar(max)
declare @name1_concat nvarchar(max)
declare @select_aggs nvarchar(max)
select @name_concat = STUFF((select distinct ',' + quotename(name) from A order by 1 for xml path('')), 1, 1, '')
select @name1_concat = STUFF((select distinct ',' + quotename(name1) from A order by 1 for xml path('')), 1, 1, '')

;with cte_all_names as (
    select name from A
    union all 
    select name1 from A
)
select @select_aggs = STUFF((select distinct ',MAX(' + quotename(name) + ') ' + quotename(name) from cte_all_names order by 1 for xml path('')), 1, 1, '')

select @sql = '
;with cte as 
(
    select *, ROW_NUMBER() over (partition by name order by percentage desc) ROWNUM
    from A
),
cte2 as
(
    SELECT Id,Code,ROWNUM,' + @name_concat + ',' + @name1_concat + '
    FROM cte
    PIVOT(MAX(activity)
          FOR name IN (' + @name_concat + ')) AS PVTTable PIVOT
          (
          MAX(percentage)
          FOR name1 IN (' + @name1_concat + ')) AS PVTTable1
)
select Id, Code, ' + @select_aggs + '
from cte2
group by Id, Code, ROWNUM
'

exec sp_executesql @sql