SQL获取所有相关行

Question

过去两周，我一直试图弄清楚（非常缓慢）如何提出一种更好的方式来查询所有相关行的ID。我的公司处于一种情况，一个品牌不断被重命名，我们没有修改以前的记录（在其他一些表格中）的选项，指向被替换的品牌。

我做了我的桌子的小，小的版本，以帮助邀请人们来检查：

CREATE TABLE #GrwHist 
(
    ID INT 
    , Acronym VARCHAR(50) 
    , New_ID INT 
) 

INSERT INTO #GrwHist VALUES(1,'ABC',33) 
INSERT INTO #GrwHist VALUES(21,'GST',NULL) 
INSERT INTO #GrwHist VALUES(33,'MnY',48) 
INSERT INTO #GrwHist VALUES(37,'FWR',89) 
INSERT INTO #GrwHist VALUES(48,'DMZ',89) 
INSERT INTO #GrwHist VALUES(89,'PLT',106) 
INSERT INTO #GrwHist VALUES(106,'TnI',NULL) 
INSERT INTO #GrwHist VALUES(120,'YIZ',143) 
INSERT INTO #GrwHist VALUES(143,'INZ',NULL) 

SELECT * FROM #GrwHist 
/* 
ID Acronym New_ID 
--- ------- ------- 
1 ABC  33 
21 GST  NULL 
33 MnY  48 
37 FWR  89 
48 DMZ  89 
89 PLT  106 
106 TnI  NULL 
120 YIZ  143 
143 INZ  NULL 
*/ 

DECLARE @ID INT 
SET @ID = 106 

SELECT * FROM #GrwHist WHERE ID = @ID 
UNION 
SELECT * FROM #GrwHist WHERE New_ID in (@ID) 
UNION 
SELECT * FROM #GrwHist WHERE New_ID in (SELECT ID FROM #GrwHist WHERE New_ID in (@ID)) 
UNION 
SELECT * FROM #GrwHist WHERE New_ID in (
    SELECT ID FROM #GrwHist WHERE New_ID in (SELECT ID FROM #GrwHist WHERE New_ID in (@ID)) 
) 
UNION 
SELECT * FROM #GrwHist WHERE New_ID in (
    SELECT ID FROM #GrwHist WHERE New_ID in (SELECT ID FROM #GrwHist WHERE New_ID in (SELECT ID FROM #GrwHist WHERE New_ID in (@ID))) 
) 
UNION 
SELECT * FROM #GrwHist WHERE New_ID in (
    SELECT ID FROM #GrwHist WHERE New_ID in (SELECT ID FROM #GrwHist WHERE New_ID in (SELECT ID FROM #GrwHist WHERE New_ID in (SELECT ID FROM #GrwHist WHERE New_ID in (@ID)))) 
) --And it grows and grows... 
GO 
DROP TABLE #GrwHist 

最后查询，基本上是：

--If I need to get all IDs related to a given ID I will get the following results: 
@ID = 106 --> 106, 89, 48, 37, 33, 1 
@ID = 143 --> 143, 120 
@ID = 21 --> 21 

的问题与此查询可能会超过7-8级，而且我想知道是否可以动态执行此操作，以便在每次添加具有关系的另一行时我的代码都需要更改。说如果添加一个新行来替换ID为106的行，我将不得不继续添加。

预先感谢您的任何帮助

Answer 1

您可以使用递归CTE获得比赛：

with cte as (
     select id, acronym, null as newid, id as baseid, 1 as lev, 
      cast(id as varchar(max)) as ids 
     from #GrwHist h 
     where newid is null 
     union all 
     select h.id, h.acronym, h.newid, cte.baseid, cte.lev + 1 
      cte.ids + ',' + cast(h.id as varchar(max)) as ids 
     from cte join 
      #GrwHist h 
      on h.new_id = cte.id 
    ) 
select baseid, ids 
from (select cte.*, max(lev) over (partition by baseid) as maxlev 
     from cte 
    ) cte 
where maxlev = lev; 

编辑：

如果有重复的，你可以用获得的每个ID ：

select baseid, id 
from cte 
order by baseid; 

在一行上获取值有点复杂。