识别适用于不同数据集的记录的SQL查询

我有一个如下的查询，它返回如下查询所示的结果。但是，我只需要这些数据的一个子集。我感兴趣的是获取仅与RegionID值2关联而不与任何其他区域关联的DocumentID

SELECT D.DocumentID, R.RegionID, COUNT(*) AS NUMOFPLANTSBYREGION 
FROM Document D INNER JOIN ShopAreaDoc SAD ON D.DocumentID = SAD.DocumentID 
INNER JOIN PlantShopAreaDoc PSAD ON SAD.ShopAreaDocID = PSAD.ShopAreaDocID 
INNER JOIN Plant P ON PSAD.PlantID = P.PlantID 
INNER JOIN Region R ON P.RegionID = R.RegionID 
GROUP BY D.DocumentID, R.RegionID 
ORDER BY D.DocumentID 

查询结果： 我感兴趣的结果集如下： 其他记录要么不适用于区域ID为2，要么适用于除2以外的更多区域，因此应排除在外

+------------+----------+----------------------+
| DocumentID | RegionID | NUMOFPLANTSBYREGION  |
+------------+----------+----------------------+
|       2126 |        2 |                    8 |
|       2127 |        2 |                    8 |
|       2128 |        2 |                    8 |
|       2129 |        2 |                    8 |
|       2130 |        2 |                    8 |
|       2137 |        2 |                    8 |
+------------+----------+----------------------+

---

您可以使用这种方法，通过以下方式实现MySQL中不存在的减号语句：

SELECT DocumentID FROM docs WHERE RegionID=2 AND DocumentID NOT IN (SELECT DocumentID FROM docs WHERE RegionID<>2)

我也试过了，它似乎很管用。

使用了一个不存在的：

---

这也将返回ID2138，因为它是区域2、1、3和4、6的一部分，OP希望将其作为需求的一部分排除。@JacobH没有注意到这些记录。请参阅修订版。@vmrao很乐意提供帮助！

  SELECT D.DocumentID, R.RegionID, COUNT(*) AS NUMOFPLANTSBYREGION 
    FROM Document D 
    INNER JOIN ShopAreaDoc SAD ON D.DocumentID = SAD.DocumentID 
    INNER JOIN PlantShopAreaDoc PSAD ON SAD.ShopAreaDocID = PSAD.ShopAreaDocID 
    INNER JOIN Plant P ON PSAD.PlantID = P.PlantID 
    INNER JOIN Region R ON P.RegionID = R.RegionID 
    WHERE R.RegionId = 2
    AND NOT EXISTS (SELECT * FROM Region R2 WHERE R2.RegionId <> 2 AND R2.DocumentId = D.documentid)
    GROUP BY D.DocumentID, R.RegionID 
    ORDER BY D.DocumentID 

SELECT DocumentID FROM docs WHERE RegionID=2 AND DocumentID NOT IN (SELECT DocumentID FROM docs WHERE RegionID<>2)

;with cte as (
  SELECT D.DocumentID, R.RegionID, COUNT(*) AS NUMOFPLANTSBYREGION 
  FROM Document D INNER JOIN ShopAreaDoc SAD ON D.DocumentID = SAD.DocumentID 
  INNER JOIN PlantShopAreaDoc PSAD ON SAD.ShopAreaDocID = PSAD.ShopAreaDocID 
  INNER JOIN Plant P ON PSAD.PlantID = P.PlantID 
  INNER JOIN Region R ON P.RegionID = R.RegionID
  GROUP BY D.DocumentID, R.RegionID 
)
select *
from cte
where not exists (
  select 1
  from cte i
  where i.DocumentID = cte.DocumentID
    and i.RegionID <> 2
  )

+------------+----------+----------------------+
| DocumentID | RegionID | NUMOFPLANTSBYREGION  |
+------------+----------+----------------------+
|       2126 |        2 |                    8 |
|       2127 |        2 |                    8 |
|       2128 |        2 |                    8 |
|       2129 |        2 |                    8 |
|       2130 |        2 |                    8 |
|       2137 |        2 |                    8 |
+------------+----------+----------------------+