完全连接具有重复值的两列

Question

我有两个 table 看起来像这样：

sMinMax:

PartNo  baseID  Min   Max  
11795   1       1     1
11795   5       0     0
11795   6       1     1
01655   65      2     3

vsStock:

PartNo  baseID  Qty
11795   1       1
11795   1       1
11795   55      1

我想加入他们，所以我得到一个 table，它显示了所有 parNo en 碱基的所有列，如下所示：

结果：

PartNo  baseID  Min   Max  Qty
11795   1       1     1     2
11795   5       0     0     null
11795   6       1     1     null
11795   55      null  null  1
01655   65      2     3     null

所以我只想在两列上使用完整的外部联接来执行此操作，但这会产生与我期望的左联接相同的结果。我尝试了 1000 次，但这是我最后一次尝试：

SELECT 
 a.sPart_ID
,a.uRALBase_ID
,a.MinQty
,a.MaxQty
,b.Qty

FROM [RALNHVTST].[dbo].[sMinMax] as a

FULL OUTER JOIN [RALNHVTST].[dbo].[vsStockList] as b

ON a.sPart_ID = b.sPart_ID
AND a.uRALBase_ID = b.uRALBase_ID
WHERE a.sPart_ID IS NOT NULL
AND a.sPart_ID = 1159

ORDER BY a.sPart_ID

但正如我所说，这给了我与 LEFT JOIN 相同的结果。有人知道我做错了什么吗？

Answer 1

类似的东西？此查询给出了与您预期相同的结果。

SELECT 
 CASE WHEN a.PartNo IS NOT NULL THEN a.PartNo ELSE b.PartNo END AS PartNo
,CASE WHEN a.baseId IS NOT NULL THEN a.baseId ELSE b.baseId END AS baseId
,a.[Min]
,a.[Max]
,SUM(b.Qty) AS Qty

FROM [dbo].[sMinMax] as a

FULL JOIN [dbo].[vsStock] as b

ON a.partNo = b.partNo
AND a.baseId = b.baseId
GROUP BY 
    CASE WHEN a.PartNo IS NOT NULL THEN a.PartNo ELSE b.PartNo END, 
    CASE WHEN a.baseId IS NOT NULL THEN a.baseId ELSE b.baseId END, 
    a.[Min],
    a.[Max]
ORDER BY 
CASE WHEN a.PartNo IS NOT NULL THEN a.PartNo ELSE b.PartNo END

Answer 2

full join 中的过滤很棘手。我建议在子查询中进行过滤和聚合：

SELECT COALESCE(sm.sPart_ID, s.sPart_Id) as sPartId,
       COALESCE(sm.uRALBase_ID, sm.uRALBase_ID
       sm.MinQty, sm.MaxQty, s.Qty
FROM (SELECT sm.*
      FROM [RALNHVTST].[dbo].[sMinMax] sm
      WHERE sm.sPart_ID = 1159
     ) sm FULL OUTER JOIN 
     (SELECT s.sPart_ID, s.uRALBase_ID, SUM(qty) as qty
      FROM [RALNHVTST].[dbo].[vsStockList] s
      WHERE s.sPart_ID = 1159
      GROUP BY s.sPart_ID, s.uRALBase_ID
     ) s
     ON sm.sPart_ID = s.sPart_ID AND
        sm.uRALBase_ID = s.uRALBase_ID
ORDER BY sPart_ID

完全连接具有重复值的两列

Full join in two columns with repeated values

sql

tsql

join

outer-join

where-clause