计算行前出现的次数[重复]

Question

我对 SQL 还很陌生，所以我不确定这是否可行。我有一个分层数据库，我正在尝试构建一个查询，该查询将按此层次结构对结果进行排序。

我不能按“TreeLevel”列排序（请参见下面的示例），因为这样孩子将与父母分开。此外，所需的顺序取决于各种表中的不同列，因此就我目前的知识而言，cte 变得更加复杂。

+-----------+---------+-------------+
| TreeLevel |  Code   | Parent Code |
+-----------+---------+-------------+
|         1 |  0770.1 |             |
|         2 | 0770.50 |      0770.1 |
|         3 |  0804.5 |     0770.50 |
|         2 | 0770.12 |      0770.1 |
|         1 |  0891.1 |             |
|         2 |    0980 |      0891.1 |
+-----------+---------+-------------+

我想通过确定 TreeLevel AT 每行的出现次数来进行排序。因此，对于 TreeLevel 中的第二个“2”，这个数字应该是 2。但是，对于第三个 2，这个数字应该是 3。这有可能吗？

提前致谢

编辑：

这是我现在拥有的 SQL：

Select ChildComp.TreeLevel, 
ChildComp.Code, 
ISNULL(ChildComp.Specification, '') AS Specification,
dbo.stkCommodities.Code as 'Stock Item Commodity Code', 
CASE WHEN ISNULL(dbo.stkCategories.Code,'') = 'SA-NP' THEN 'SA-NP' ELSE '' END AS 'Category Code', 
ChildComp.Quantity,
LEFT(ChildComp.Description, CHARINDEX(' -', ChildComp.Description, 1))  as posnr, 
stkStockItems.Description as 'Stock Item Description',
ParentComp.Code AS 'Parent Component Code',
CASE WHEN ISNULL(ChildComp.Specification, '') = '' Then ParentComp.Code Else CONCAT(ParentComp.Code, '_', ISNULL(ChildComp.Specification, '')) END AS 'Component Code + Rev'
From dbo.astComponents AS ChildComp
LEFT Join dbo.astAssets ON ChildComp.AssetId = astAssets.Id 
LEFT Join dbo.stkStockItems ON ChildComp.Code = stkStockItems.Code
LEFT Join dbo.stkCommodities ON stkStockItems.CommodityId = stkCommodities.Id
LEFT Join dbo.stkCategories ON stkStockItems.CategoryId = stkCategories.Id
LEFT Join dbo.astComponents AS ParentComp ON ChildComp.ParentComponentId = ParentComp.Id
LEFT Join dbo.stkStockItems As ParentItems ON ParentComp.Code = ParentItems.Code
LEFT Join dbo.stkCommodities AS ParentCom ON ParentItems.CommodityId = ParentCom.Id
Where astAssets.Code = '2018010084' AND (dbo.stkCommodities.Code <> 'RM' OR dbo.stkCommodities.Code IS NULL ) AND
(ParentCom.Code <> 'WA' OR ParentCom.Code IS NULL )

表格：

dbo.astComponents

dbo.astAssets

dbo.stkStockItems

dbo.stkCommodities

dbo.stkCategories

很抱歉将表格共享为链接，但这些表格确实很长

Answer 1

您可以使用递归 CTE：

with cte as (
      select 1 as lev, code, parent
      from t
      where parent is null
      union all
      select lev + 1, t.code, t.parent
      from cte join
           t
           on t.parent = cte.code
     )
select *
from cte;