Question

我有以下查询从表中生成结果的子集。这些结果是~3000，状态表中有〜230,000个roes：

SELECT ms1.* FROM STATUS MS1
INNER JOIN
(
    SELECT MS.EndDate as MDT, MS.ID, MS.StatusID, MS.StartDate  
    FROM MEMBER M
    INNER JOIN STATUS MS ON MS.ID = M.ID 
    AND MS.StartDate =(SELECT MAX(StartDate) FROM STATUS WHERE STATUS.ID = M.ID)
    WHERE MS.EndDate IS NOT NULL
    GROUP BY MS.ID, MS.StatusID, MS.EndDate, MS.StartDate ) MS2
ON MS1.ID = ms2.ID AND MS1.StatusID = MS2.StatusID

从我想要更新的查询返回的是这些记录。然后我接受上面的查询并将其包装在这样的更新语句中：

UPDATE STATUS 
SET EndDate = NULL
WHERE EXISTS 
(
INNER JOIN
(
    SELECT MS.EndDate as MDT, MS.ID, MS.StatusID, MS.StartDate  
    FROM MEMBER M
    INNER JOIN STATUS MS ON MS.ID = M.ID 
    AND MS.StartDate =(SELECT MAX(StartDate) FROM STATUS WHERE STATUS.ID = M.ID)
    WHERE MS.EndDate IS NOT NULL
    GROUP BY MS.ID, MS.StatusID, MS.EndDate, MS.StartDate ) MS2
ON MS1.ID = ms2.ID AND MS1.StatusID = MS2.StatusID
)

我在上面原始选择中的记录中违反了唯一键约束，因此更新正在尝试更新我不希望它更新的行。我得到的信息是：

违反UNIQUE KEY约束'UK_status_ID_ENDDATE'。无法在对象'dbo.STATUS'中插入重复键。重复键值为（3，）。

我不确定我做错了什么。

Answer 1

尝试类似下面的内容

update MS
set
    MS.EndDate = NULL
from
    MEMBER M
    INNER JOIN STATUS MS 
        ON MS.ID = M.ID 
        AND MS.StartDate = ( SELECT MAX(StartDate) FROM STATUS WHERE STATUS.ID = M.ID )
WHERE 
    MS.EndDate IS NOT NULL

声明尝试更新不在子选择中的记录

1 个答案: