仓库移动建议（合并两个表并填写）- 仅通过 SQL 光标？

Question

我将每个仓库公司的所有产品分成两个数据库 tables（给予者和接受者），并使用某种逻辑为每条记录排序，以按其优先级进行处理。我最终得到了两个 table。第一个 table 包含付出者，第二个 table 包含接受者

我正在努力创造一个结果，该结果将连续提出从给予者到接受者所需的动作。这只能由 SQL Cursor 处理吗？我可以在不使用 Cursor 的情况下得到结果吗，因为它对我来说很复杂？任何帮助将不胜感激..

捐赠者TABLE

Product	QtyAllowedToGive	Warehouse_ID_Giver	Rank
A	30	100	1
A	30	101	2
A	10	102	3
B	10	200	4
B	6	201	9
D	5	300	10

接受者TABLE

Product	QtyAllowedToTake	Warehouse_ID_Taker	Rank
A	50	200	1
A	5	203	2
A	11	202	3
B	16	202	4
B	3	202	5
C	10	300	6

需要结果

Product	QtyToMove	Warehouse_ID_Giver	Warehouse_ID_Taker
A	30	100	200
A	20	101	200
A	5	101	203
A	5	101	202
A	6	102	202
B	10	200	202
B	9	201	202

Answer 1

也许是这样的？

drop table #Givers
select *
into #Givers
from (values 
 ('A',  30, 100,    1)
,('A',  30, 101,    2)
,('A',  10, 102,    3)
,('B',  10, 200,    4)
,('B',  6,  201,    9)
,('D',  5,  300,    10)
) T(Product,QtyAllowedToGive,   Warehouse_ID_Giver, [Rank])
drop table #Takers
select *
into #Takers
from (values 
 ('A',  50, 200,    1)
,('A',  5,  203,    2)
,('A',  11, 202,    3)
,('B',  16, 202,    4)
,('B',  3,  202,    5)
,('C',  10, 300,    6)
) T(Product,    QtyAllowedToTake,   Warehouse_ID_Taker, [Rank])


declare TakerCursor cursor fast_forward for
   select Product, QtyAllowedToTake, WareHouse_ID_Taker  from #Takers order by  Product, [Rank];
declare GiverCursor cursor fast_forward for
   select Product, QtyAllowedToGive, WareHouse_ID_Giver from #Givers order by Product, [Rank];

declare @TakerProduct char(1)='', @QtyAllowedToTake integer=0, @WareHouseID_Taker integer=0; 
declare @GiverProduct char(1)='', @QtyAllowedToGive integer=0, @WareHouseID_Giver integer=0; 

open TakerCursor
open GiverCursor

fetch next from TakerCursor into @TakerProduct, @QtyAllowedToTake, @WareHouseID_Taker;
if @@FETCH_STATUS<>0 return -- no more Takers
fetch next from GiverCursor into @GiverProduct, @QtyAllowedToGive, @WareHouseID_Giver;
if @@FETCH_STATUS<>0 return -- no more Givers

declare @QtyToMove integer=0
declare @Output table (Product char(1), Warehouse_ID_Giver integer, WareHouse_ID_Taker integer, Qty integer);
while 1=1 begin

  if @TakerProduct=@GiverProduct begin
     if @QtyAllowedToTake<=@QtyAllowedToGive
        set @QtyToMove=@QtyAllowedToTake
     else
       set @QtyToMove=@QtyAllowedToGive 
    
     insert into @Output (Product, Warehouse_ID_Giver, WareHouse_ID_Taker, Qty)
        Select Product=@TakerProduct
              --, QtyAllowedToTake=@QtyAllowedToTake, QtyAllowedToGive=@QtyAllowedToGive, 
              , Giver=@WareHouseID_Giver
              , Taker=@WareHouseID_Taker
              , Qty=@QtyToMove;

     set @QtyAllowedToTake=@QtyAllowedToTake-@QtyToMove
     set @QtyAllowedToGive=@QtyAllowedToGive-@QtyToMove

     if @QtyAllowedToGive=0 begin
         fetch next from GiverCursor into @GiverProduct, @QtyAllowedToGive, @WareHouseID_Giver;
         if @@FETCH_STATUS<>0 break -- no more Givers
     end
     if @QtyAllowedToTake=0 begin
        fetch next from TakerCursor into @TakerProduct, @QtyAllowedToTake, @WareHouseID_Taker;
        if @@FETCH_STATUS<>0 break -- no more Takers
     end
  end else
  if @TakerProduct>@GiverProduct begin
     fetch next from GiverCursor into @GiverProduct, @QtyAllowedToGive, @WareHouseID_Giver;
     if @@FETCH_STATUS<>0 break -- no more Givers
  end else
  if @TakerProduct<@GiverProduct begin
     fetch next from TakerCursor into @TakerProduct, @QtyAllowedToTake, @WareHouseID_Taker;
     if @@FETCH_STATUS<>0 break -- no more Takers
  end
end
close GiverCursor
close TakerCursor
deallocate GiverCursor
deallocate TakerCursor
select * from @Output

没有错误检查或整理或优化。

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