TSQL更新與內聯，分組和

Question

我想更新從當前日期和原始日期之間發生的最早開始日期的日期。我的查詢是：

update TableA 
set [Stop_Date] =DATA.Min_Start 
FROM TableA 
JOiN 
    (select min(TableB.START_DTTM) as Min_Start 
      from TableB 
      where 
       TableB.CancelReason ='Treatment'   AND 
       TableA.Start_Date>=TableB.START_DTTM  AND 
       TableB.START_DTTM '< GETDATE() 
     ) DATA 
      ON   TableA.Ref_No=TableB.REFRL_REFNO 
      where 
       [Stop_Date] is null 

但是TableA.Start_Date似乎會導致問題。任何人都可以幫助正確的SQL？

下面是一些測試數據：

DECLARE @TableA TABLE (Ref_No Int, Stop_Date DateTime,Start_Dat DateTime) 
DECLARE @TableB TABLE (REFRL_REFNO int, CancelReason varchar(50), START_DTTM DateTime, 
    Stop_DTTM DateTime,Comments varchar(50)) 
insert @TableA 
select 1,    '10 jan 2000',    '5 jan 2000' 
insert @TableA 
select 4,    NULL,      '9 jan 2000' 
insert @TableB 
select 1,'Treatment','8 Jan 2000','9 Jan 2000','Shouldn''t be used' 
insert @TableB 
select 4,'Treatment','1 Jan 2000','2 Jan 2000','Shouldn''t be used' 
insert @TableB 
select 4,'Treatment','21 Jan 2000','22 Jan 2000','Shouldn''t be used' 
insert @TableB 
select 4,'Treatment','11 Jan 2000','12 Jan 2000','Should be used' 
insert @TableB 
select 4,'Other','10 Jan 2000','11 Jan 2000','Shouldn''t be used' 

Answer 1

你的條件TableA.Start_Date>=TableB.START_DTTM AND TableB.START_DTTM '< GETDATE()是錯誤的。這將TableB值限制爲startdate之前的值，小於當前日期而不是兩者之間的值。

以下顯示工作。

UPDATE TableA 
SET Stop_Date = 
    (
    SELECT MIN(TableB.START_DTTM) 
    FROM TableB 
    WHERE 
    TableA.Ref_No = TableB.REFRL_REFNO 
    AND (TableB.CancelReason = 'Treatment') 
    AND (TableB.START_DTTM BETWEEN TableA.[Start_Date] AND GETDATE()) 
    ) 
WHERE (TableA.Stop_Date IS NULL)