如何选择具有一个活动但没有另一个活动的货件

Question

表的简化版本

Table ActivityHistory:

ActivityHistoryid(PK) | ShipmentID | ActivityCode | Datetime  
1                     | 1          | CodeA        |  
2                     | 1          | CodeB        |  
3                     | 1          | CodeC        |  
4                     | 2          | CodeA        |  
5                     | 3          | CodeA        |  
6                     | 3          | CodeB        |  
7                     | 4          | CodeC        |  

此表包含给定货件发生的活动列表.
任务:我需要选择有"CodeA"和没有"CodeC"活动的货件(货件ID).
在此示例中,货件ID 2和3将与条件匹配.
表装运:(装运ID(PK),其他装运相关列)

谢谢.

Answer 1

试试这个 -

查询:

DECLARE @temp TABLE
(
      ActivityHistoryid INT
    , ShipmentID INT
    , ActivityCode VARCHAR(20)
)

INSERT INTO @temp (ActivityHistoryid, ShipmentID, ActivityCode)
VALUES 
    (1, 1, 'CodeA'),
    (2, 1, 'CodeB'),
    (3, 1, 'CodeC'),
    (4, 2, 'CodeA'),
    (5, 3, 'CodeA'),
    (6, 3, 'CodeB'),
    (7, 4, 'CodeC') 

SELECT * 
FROM @temp t
WHERE ActivityCode = 'CodeA'
    AND NOT EXISTS(
        SELECT 1
        FROM @temp t2
        WHERE t2.ActivityCode = 'CodeC'
            AND t2.ShipmentID = t.ShipmentID
    )

输出:

ActivityHistoryid ShipmentID  ActivityCode
----------------- ----------- --------------------
4                 2           CodeA
5                 3           CodeA