如何用递归查询构造SQL pivot table

Question

假设我有这些 tables

工单：

[Id], [ServiceId], [StatusId]

服务 <-- 自引用 table

[Id], [SName], [SCode], [SDnaCode], [SerivceParentId:Nullable]

状态

[Id], [StName], [StCode]

现在如何获得像这样的枢轴 table 结果：

|StName   |RootService_1|RootService_2|...
+---------+-------------+-------------+----
|Initiated|23           |12           |...
|Closed   |8            |5            |...

请记住，计数是针对根服务的，每个根服务都有自己的层次结构

[Service]table

中的示例记录

|ID|SName        |SCode|SDnaCode|SerivceParentId|
+--+-------------+-----+--------+---------------+
| 1|RootService_1|RS01 |RS01    |NULL           |
| 2|RS01_Child_1 |C01  |RS01.C01|1              |
| 3|RS01_Child_2 |C02  |RS01.C02|1              |
| 4|RootService_2|RS02 |RS02    |NULL           |
| 5|RS02_Child_1 |C01  |RS02.C01|2              |
| 6|RS02_Child_2 |C02  |RS02.C02|2              |

因此 RootService_1 下的示例主元 table 中的数字 23 是 Initiated WorkOrder 的计数 ServiceId 1,2 或3 合并

请记住，我想将其包装在动态 SQL 中以便为枢轴生成值 table for clause.

我希望我能很好地解释我的问题，在此先感谢

Answer 1

我找到了一个解决方案，虽然我希望有一个文本数据依赖性较低的解决方案此解决方案取决于 SDnaCode 列，在我的情况下是 ServiceDnaCode，我将其设为存储过程

CREATE PROCEDURE DashboardGetServicesDataByStatus @lvl int, @parentId  NVARCHAR(MAX)
AS
BEGIN

DECLARE 
    @columns NVARCHAR(MAX) = '', 
    @sql     NVARCHAR(MAX) = '',
    @sqlCommand nvarchar(max)=''; 

-- select the StatusName
set @sqlCommand = 'SELECT 
    @columns+=QUOTENAME(
    (SELECT value from string_split(ServiceDnaCode,''.'')
order by CURRENT_TIMESTAMP
OFFSET      @lvl rows
fetch next 1 rows only)) + '',''
FROM 
    [Service] where ParentServiceId' + 
        case
            when @lvl>0 then ' IN(@parentId)'
            else    ' is null '
        end
    + '
ORDER BY 
    Id;';

EXECUTE sp_executesql @sqlCommand, N'@lvl int,@parentId NVARCHAR(max),@columns NVARCHAR(max) OUTPUT'
, @lvl = @lvl,@parentId=@parentId, @columns=@columns OUTPUT

-- remove the last comma
SET @columns = LEFT(@columns, LEN(@columns) - 1);

print @columns
print @lvl

-- construct dynamic SQL
SET @sql ='
with cte_service as (
select * from [Service] where [Service].Id IN ('+CAST(@parentId as varchar(max))+')
union all
select e.* from [Service] e inner join cte_service o on e.ParentServiceId= o.Id
)

SELECT * FROM (
select count(wo.Id) ID,os.StatusName STATENAME ,
(SELECT value from string_split(ServiceDnaCode,''.'')
order by CURRENT_TIMESTAMP
OFFSET      '+CAST(@lvl as varchar(max))+' rows
fetch next 1 rows only) SNAME from WorkOrder wo 
left join RefWorkOrderStatus os on wo.OrderStatusCode=os.Id 
left join [Service] s on wo.MainServiceId=s.Id
where wo.MainServiceId IN (select Id from cte_service)
group by os.StatusName,s.ServiceDnaCode
) t
pivot(
sum(ID)
for SNAME IN ('+ @columns +')
) as pivottable';

-- execute the dynamic SQL
EXECUTE sp_executesql @sql;

END
Go

如何用递归查询构造SQL pivot table

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