Question

我有一个存储过程，它创建4个临时表，然后返回带有内部连接的大选择的记录。这是返回记录的select的缩减版本。

SELECT R.*,
    REC.Status_Date as [Receive Status Date],
    RET.Status_Date as [Return Status Date]
FROM    #Records R
    INNER JOIN #Temp_Receive REC ON R.ID1 = REC.ID1 
    INNER JOIN #Temp_Return RET ON R.ID1 = RET.ID1 
    INNER JOIN #Temp_Submittal SUB ON SUB.RecID = REC.ID AND SUB.RetID = RET.ID

请注意，同一ID1可能有多个#TEMP_Receive和#TEMP_Return记录，而#TEMP_Submittal表是连接它们的记录。

我需要修改此过程，以在结果中包含的两个不同表中包含两个状态日期之间的假日数。我可以从单独的表中计算假期数。像这样：

Select count(*)
From Holiday_List
Where Holiday_Date between REC.Status_Date and RET.Status_Date

我在#Temp_Receive表中添加了一列Holiday_Count。如何使用Holiday_List表中的计数更新联接中的Holiday_Count列？我尝试过类似的东西，但从我能找到的，这不是远程有效的SQL语法。

UPDATE 
(   #Records R
    INNER JOIN #TEMP_Receive REC ON R.ID1 = REC.ID1 
    INNER JOIN #TEMP_Return RET ON R.ID1 = RET.ID1 
    INNER JOIN #TEMP_Submittal SUB ON SUB.RecID = REC.ID AND SUB.RetID = RET.ID )
SET REC.Holiday_Count = 
( SELECT COUNT(*) 
  FROM HOLIDAY_LIST HOL
  WHERE HOL.HOLIDAY_DATE between #TEMP_Receive.Status_Date AND #TEMP_Receive.Status_Date )

我正在运行MS SQL Server 2012。

Answer 1

1）尝试构建select语句以查看将更新哪些行。在您的情况下，查询可能如下所示。

SELECT R.*,
    REC.Status_Date as [Receive Status Date],
    RET.Status_Date as [Return Status Date],
    (Select count(*)
        From Holiday_List
        Where Holiday_Date between REC.Status_Date and RET.Status_Date) cnt
FROM    #Records R
    INNER JOIN #Temp_Receive REC ON R.ID1 = REC.ID1 
    INNER JOIN #Temp_Return RET ON R.ID1 = RET.ID1 
    INNER JOIN #Temp_Submittal SUB ON SUB.RecID = REC.ID AND SUB.RetID = RET.ID

2）如果一切正常，请用select语句替换update部分。

update #Temp_Receive
    set Holiday_Count = (Select count(*)
        From Holiday_List
        Where Holiday_Date between REC.Status_Date and RET.Status_Date)
FROM    #Records R
    INNER JOIN #Temp_Receive REC ON R.ID1 = REC.ID1 
    INNER JOIN #Temp_Return RET ON R.ID1 = RET.ID1 
    INNER JOIN #Temp_Submittal SUB ON SUB.RecID = REC.ID AND SUB.RetID = RET.ID

另请注意，多个inner join隐式表明所有4个表中都存在相同的ID1。

基于count

1 个答案: