SQL：階層型（一対多）データから平らな文字列を作成する

Question

以下のように、データをフォーマットに変換する作業をしています。 私は最終的にそれをやったが、どのように改善できるか知りたい。 最終的な解決策への私のステップが含まれています。 正しい結果が最終クエリによって生成されます。フォーマット：Location1：Date1：​​Code1、Code2、Code ...：Date2：Code1、Code2、Code ...：Date ...：Code ... // Location2：Date ...：Code ...//場所... ...日付...コード...

結果： Loc1：2016-01-01：Alpha：2016-01-03：Bravo、Charlie、Charlie：2016-01-04：アルファ、アルファ：2016年1月5日：アルファ、デルタ、エコー// LOC2：2016年1月1日：ブラボー、デルタ// LOC3：2016年1月2日：ブラボー

declare @Operation table (
ID int identity not NULL, 
ItemID int, 
LocationID int, 
[Date] date 
) 

declare @Location table (
ID int identity not NULL, 
Name varchar(200) 
) 

declare @LineItem table (
ID int identity not NULL, 
OperationID int, 
CodeID int 
) 

declare @Code table (
ID int identity not NULL, 
Value varchar(200) 
) 

insert @Operation 
values 
(1, 1, '2016-01-01'), 
(1, 2, '2016-01-01'), 
(1, 1, '2016-01-03'), 
(1, 1, '2016-01-04'), 
(1, 3, '2016-01-02'), 
(1, 1, '2016-01-05') 

insert @Location 
values 
('Loc1'), 
('Loc2'), 
('Loc3') 

insert @LineItem 
values 
(1, 1), 
(2, 4), 
(2, 2), 
(3, 3), 
(3, 2), 
(3, 3), 
(4, 1), 
(4, 1), 
(5, 2), 
(6, 5), 
(6, 4), 
(6, 1) 

insert @Code 
values 
('Alpha'), 
('Bravo'), 
('Charlie'), 
('Delta'), 
('Echo') 

select 
* 
from @Operation vo 
join @Location vl 
on vl.ID = vo.LocationID 
join @LineItem vli 
on vli.OperationID = vo.ID 
join @Code vc 
on vc.ID = vli.CodeID 

select 
vl.Name as OpLocation, 
vo.[Date] as OpDate, 
OpCodes 
from @Operation vo 
join @Location vl 
on vl.ID = vo.LocationID 
cross apply (
select 
    stuff(List, 1, 1, '') as OpCodes 
from (
    select 
     ',' + vc.Value 
    from @LineItem vli 
    join @Code vc 
     on vc.ID = vli.CodeID 
    where vli.OperationID = vo.ID 
    order by vc.Value 
    for xml path('') 
    ) as X(List) 
) as xCodes 

select 
vl.Name as OpLocation, 
vo.[Date] as OpDate, 
OpCodes 
from @Operation vo 
join @Location vl 
on vl.ID = vo.LocationID 
cross apply (
select 
    stuff(List, 1, 1, '') as OpCodes 
from (
    select 
     ',' + vc.Value 
    from @LineItem vli 
    join @Code vc 
     on vc.ID = vli.CodeID 
    where vli.OperationID = vo.ID 
    order by vc.Value 
    for xml path('') 
    ) as X(List) 
) as xCodes 
group by vl.Name, vo.[Date], OpCodes 

select 
vl.Name as OpLocation, 
OpDateAndCodes 
from @Operation vo 
join @Location vl 
on vl.ID = vo.LocationID 
cross apply (
select 
    convert(varchar(10), [Date], 21) + ':' + OpCodes as OpDateAndCodes 
from (
    select 
     stuff(List, 1, 1, '') as OpCodes 
    from (
     select 
      ',' + vc.Value 
     from @LineItem vli 
     join @Code vc 
      on vc.ID = vli.CodeID 
     where vli.OperationID = vo.ID 
     order by vc.Value 
     for xml path('') 
     ) as X(List) 
    ) as Codes 
) as xODC 
group by vl.Name, OpDateAndCodes 

;with cte as (
select 
    vl.Name as Location, 
    OpDateAndCodes 
from @Operation vo 
join @Location vl 
    on vl.ID = vo.LocationID 
cross apply (
    select 
     convert(varchar(10), [Date], 21) + ':' + OpCodes as OpDateAndCodes 
    from (
     select 
      stuff(List, 1, 1, '') as OpCodes 
     from (
      select 
       ',' + vc.Value 
      from @LineItem vli 
      join @Code vc 
       on vc.ID = vli.CodeID 
      where vli.OperationID = vo.ID 
      order by vc.Value 
      for xml path('') 
      ) as X(List) 
     ) as Codes 
    ) as xODC 
) 
select 
    Location, 
    stuff(List, 1, 1, '') as ODC 
from cte cte1 
cross apply (
    select 
     ':' + OpDateAndCodes 
    from cte cte2 
    where cte2.Location = cte1.Location 
    for xml path('') 
    ) as X(List) 

//SOLUTION 
;with cte as (
select 
    vl.Name as Location, 
    OpDateAndCodes 
from @Operation vo 
join @Location vl 
    on vl.ID = vo.LocationID 
cross apply (
    select 
     convert(varchar(10), [Date], 21) + ':' + OpCodes as OpDateAndCodes 
    from (
     select 
      stuff(List, 1, 1, '') as OpCodes 
     from (
      select 
       ',' + vc.Value 
      from @LineItem vli 
      join @Code vc 
       on vc.ID = vli.CodeID 
      where vli.OperationID = vo.ID 
      order by vc.Value 
      for xml path('') 
      ) as X(List) 
     ) as Codes 
    ) as xODC 
) 
select 
    distinct 
     stuff(List, 1, 2, '') 
from cte cte1 
cross apply (
    select 
     '//' + OpLocationDateAndCodes 
    from (
     select 
      distinct 
       Location + ':' + stuff(List, 1, 1, '') as OpLocationDateAndCodes 
     from cte cte2 
     cross apply (
      select 
       ':' + OpDateAndCodes 
      from cte cte3 
      where cte3.Location = cte2.Location 
      for xml path('') 
      ) as X(List) 
     ) as OLDC 
    for xml path('') 
    ) as X(List) 

Answer 1

は、ここで私はアプローチですサブクエリを使用した単一のクエリを使用することができました。出力はあなたのコードと正確に一致します。

SELECT STUFF((
    SELECT 
     '//' + L.Name 
     + (
      SELECT ':' + CONVERT(VARCHAR(50), O.Date) + ':' 
       + STUFF((
        SELECT ',' + C.Value 
        FROM @LineItem LI 
         INNER JOIN @Code C 
          ON C.ID = LI.CodeID 
        WHERE LI.OperationID = O.ID 
        FOR XML PATH('')), 1, 1, '') 
      FROM @Operation O 
      WHERE O.LocationID = L.ID 
      FOR XML PATH('') 
     ) 
    FROM @Location L 
    FOR XML PATH('') 
), 1, 2, '')