Sql 使用大小写表达式从另一个表更新表

当“statustype”=out时，我想从“DateAttent”列中的表“dailydata”更新表“dailydatawh”中的列“statusout”

UPDATE DAILYDATAWH 
SET STATUSOUT=
(SELECT 
 (case when STATUSTYPE='OUT' then DATEATTEND end)as STATUSOUT
FROM DAILYDATA
GROUP By NIP,NAME,DEPARTMENT,DATEATTEND,STATUSTYPE)
WHERE STATUSOUT = NULL

--

在我尝试下面的答案之后

此查询是有效的，但当我在表DAILYDATA中输入新数据（NIP、姓名、部门、DateAttain、STATUSTYPE）时，“STATUSOUT”（表DAILYDATAWH）中的新值仍然显示在前一个日期

这是带有查询的当前输出：

这是示例输入

这是示例输出

您可以内部联接表（这里我假设它基于列

NIP

，因为没有提供实际信息）

更新的查询

UPDATE DDW
SET    STATUSOUT = DD.DATEATTEND 
FROM   dailydatawh DDW
       INNER JOIN 
       (
           SELECT NIP, NAME, DEPARTMENT, DATEATTEND = MAX(DATEATTEND)
           FROM   dailydata 
           WHERE  STATUSTYPE = 'OUT'
           GROUP BY NIP, NAME, DEPARTMENT
       ) DD                    ON DDW.NIP = DD.NIP
                              AND DDW.NAME = DD.NAME
                              AND DDW.DEPARTMENT = DD.DEPARTMENT
WHERE DDW.STATUSOUT IS NULL

更新了查询#2

这是将插入和更新合并到单个查询中的查询

; WITH CTE AS
(
    SELECT *, RN = ROW_NUMBER() OVER (PARTITION BY NIP, NAME, DEPARTMENT 
                                          ORDER BY DATEATTEND)
    FROM   DAILYDATA
)
INSERT INTO DAILYDATAWH (NIP, NAME, DEPARTMENT, STATUSIN, STATUSOUT)
SELECT  NIP, NAME, DEPARTMENT, STATUSIN = MIN(DATEATTEND), STATUSOUT = MAX(DATEATTEND)
FROM    CTE
GROUP BY NIP, NAME, DEPARTMENT, (RN - 1) / 2

---

您的问题是什么？对不起，我的问题是当statustype=out时，如何从该表中更新包含“DateAttent”的列“statusout”。我一直在尝试该查询，但仍然无法确定这两个表的关系（列名）是什么？@Squirrel我还没有确定，但我认为列“NIP+name”可以是关系，因为不能与其他人相同。应始终将完整值与“STATUSOUT is NULL”进行比较。注释不用于扩展讨论；这段对话一直是。我想这么做，但似乎没有任何选择。对不起，我不知道怎么做

UPDATE DDW
SET    STATUSOUT = DD.DATEATTEND 
FROM   dailydatawh DDW
       INNER JOIN dailydata DD ON DDW.NIP = DD.NIP
                              AND DDW.NAME = DD.NAME
                              AND DDW.DEPARTMENT = DD.DEPARTMENT
WHERE  DD.STATUSTYPE = 'OUT'

UPDATE DDW
SET    STATUSOUT = DD.DATEATTEND 
FROM   dailydatawh DDW
       INNER JOIN 
       (
           SELECT NIP, NAME, DEPARTMENT, DATEATTEND = MAX(DATEATTEND)
           FROM   dailydata 
           WHERE  STATUSTYPE = 'OUT'
           GROUP BY NIP, NAME, DEPARTMENT
       ) DD                    ON DDW.NIP = DD.NIP
                              AND DDW.NAME = DD.NAME
                              AND DDW.DEPARTMENT = DD.DEPARTMENT
WHERE DDW.STATUSOUT IS NULL

UPDATE DDW
SET    STATUSOUT = DD.DATEATTEND 
FROM   dailydatawh DDW
       CROSS APPLY
       (
           SELECT TOP 1 d.DATEATTEND
           FROM   dailydata d
           WHERE  d.STATUSTYPE = 'OUT'
           AND    d.NIP =  DDW.NIP
           AND    d.NAME = DDW.NAME
           AND    d.DEPARTMENT = DDW.DEPARTMENT
           ORDER BY d.ID DESC
       ) DD
WHERE  DDW.STATUSOUT IS NULL

; WITH CTE AS
(
    SELECT *, RN = ROW_NUMBER() OVER (PARTITION BY NIP, NAME, DEPARTMENT 
                                          ORDER BY DATEATTEND)
    FROM   DAILYDATA
)
INSERT INTO DAILYDATAWH (NIP, NAME, DEPARTMENT, STATUSIN, STATUSOUT)
SELECT  NIP, NAME, DEPARTMENT, STATUSIN = MIN(DATEATTEND), STATUSOUT = MAX(DATEATTEND)
FROM    CTE
GROUP BY NIP, NAME, DEPARTMENT, (RN - 1) / 2