跨3列递归查询（OrderID、OriginalOrderID、GroupOrderID）

Question

我有一个 SQL 表，其中特别包含 3 个感兴趣的列： 订单ID、原始订单ID、父订单ID

列的使用对于这个问题并不重要。尽管如此，OrderID 是订单的开始，而其他两个列则用于针对原始 Order-ID 的退款等。 OrderID 是 PK，而其他 2 列有自己的索引。

我编写了以下递归查询。目的是搜索订单 ID 并返回在上述 3 列中任意一列中包含该订单 ID 值的所有行。

显然，我希望脚本高效，只读取关联的行而不是表中的所有内容（我怀疑这可能正在发生）。

为了本文的目的，这里有一些示例数据：

declare @MyTable table (OrderID int, OriginalOrderID int, ParentOrderID int)
insert into @MyTable values
(437, 421, 436)
,(436, 420, null)
,(421, null, 420)
,(420, null, null)

话虽如此，这是我对 CTE 的尝试。 预先感谢您的见解和解释。

DECLARE @OrderIDs table (OrderId int, isParent bit)

-- ----------------------------\
-- Define the Order Id .. can be Original/Parent ID or Spawn/Child/Conversion ID:
DECLARE @SearchOrderID as int = 421
-- ----------------------------/

-- Build CTE to find all related (parent / child) OrderIDs:

;WITH Children as (
    select o1.orderId
        , o1.parentOrderId
        , o1.originalOrderId
    from @MyTable o1
    where o1.orderId = @SearchOrderID

    UNION ALL -- Add all rows from 1st query results to the subsequent recursive query's results

    select o2.orderId
        , o2.parentOrderId
        , o2.originalOrderId
    from @MyTable o2
    inner join Children co on co.orderId = o2.originalOrderId

    UNION ALL

    select o3.orderId
        , o3.originalOrderId
        , o3.parentOrderId
    from @MyTable o3
    inner join Children co on co.orderId = o3.ParentOrderID
),
Original as (
    select o1.orderId
        , o1.originalOrderId
        , o1.parentOrderId
    from @MyTable o1
    where o1.orderId = @SearchOrderID

    UNION ALL

    select o2.orderId
        , o2.originalOrderId
        , o2.parentOrderId
    from @MyTable o2
    inner join Original oo on oo.originalOrderId = o2.orderId

    UNION ALL

    select o3.orderId
        , o3.originalOrderId
        , o3.parentOrderId
    from @MyTable o3
    inner join Original oo on oo.OriginalOrderID = o3.ParentOrderID
),
Parents as (
    select o1.orderId
        , o1.originalOrderId
        , o1.parentOrderId
    from @MyTable o1
    where o1.orderId = @SearchOrderID

    UNION ALL

    select o2.orderId
        , o2.originalOrderId
        , o2.parentOrderId
    from @MyTable o2
    inner join Parents po on po.ParentOrderId = o2.orderId

    UNION ALL

    select o3.orderId
        , o3.originalOrderId
        , o3.parentOrderId
    from @MyTable o3
    inner join Parents po on po.ParentOrderID = o3.OriginalOrderID
)

insert into @OrderIDs
    select orderId, 0 from Children
    UNION
    select orderId, 0 from Original
    UNION
    select orderId, 0 from Parents

-- Show Parent / Child relationship:
select * from @OrderIDs
order by IsParent desc

Answer 1

这样不行吗？

declare @SearchOrderID as int = 420;
select * , case when @SearchOrderID=ParentOrderId then 1 else 0 end as IsParent
from @MyTable M 
where OrderID in (select OrderId
                  from @MyTable
                  where @SearchOrderID in (OrderID, OriginalOrderID, ParentOrderID))