在子查询中带有多部分标识符问题的SQL查询

Question

我有一个查询应该返回“status”--duration条目的总和。持续时间通过使用datediff计算（n，datestamp，（返回结束当前状态的日期戳记的子查询，即发现下一个配件“状态更改” - 在锁定的那个之后进入）

我的问题是以下查询返回的多部分的标识符错误

• 的INC表给我 “INCIDENT_NUMBER”我正在寻找至极的其他表中相关 “NUMBER”
• ACTM1保存所有DATESTAMP-条目
• ACTA1与ACTM1通过“THENU” MBER”，并保存有关条目是否是一个装配状态更改或不是所有的信息

代码：

SELECT SUM(DATEDIFF(n, ACTM1.DATESTAMP, END_DATESTAMP_TABLE.END_DATESTAMP)) 
FROM INC    LEFT OUTER JOIN 
    ACTM1 ON INC.INCIDENT_NUMBER = ACTM1.NUMBER LEFT OUTER JOIN 
    ACTA1 ON ACTM1.THENUMBER = ACTA1.THENUMBER LEFT OUTER JOIN 
/**/ 
    (SELECT ACTM1_1.NUMBER, ACTM1_1.DATESTAMP AS END_DATESTAMP 
    FROM ACTM1 AS ACTM1_1    LEFT OUTER JOIN 
/**/ 
     (SELECT ACTM1_1_1.NUMBER, MIN(ACTM1_1_1.THENUMBER) AS FOLLOWUP_THENUMBER 
    FROM ACTM1 AS ACTM1_1_1 
    WHERE (ACTM1_1_1.THENUMBER > /**/ ACTM1_1.THENUMBER)/*I think here lies the problem*/ 
     AND (ACTM1_1_1.[TYPE] IN ('Open', 'Status Change', 'Resolved', 'Closed'))) 
    AS FOLLOWUP_THENUMBER_TABLE 
/**/ 
      ON ACTM1_1.NUMBER = FOLLOWUP_THENUMBER_TABLE.NUMBER) 
    AS END_DATESTAMP_TABLE 
/**/ 
      ON ACTM1.NUMBER = END_DATESTAMP_TABLE.NUMBER 
WHERE ... 

我将是任何有帮助的评论感谢或暗示你能给我这个，

PS

Answer 1

左侧加盟关系不能引用右侧，因此这是非法的：

SELECT ... 
FROM A 
JOIN (SELECT ...FROM ... WHERE ... = A.Field) AS B ON A.ID = B.ID; 

使用应用操盘手：

SELECT ... 
FROM A 
APPLY (SELECT ...FROM ... WHERE ... = A.Field AND ID = A.ID) AS B; 

在你的情况很可能会像下面：

SELECT SUM(DATEDIFF(n, ACTM1.DATESTAMP, END_DATESTAMP_TABLE.END_DATESTAMP)) 
FROM INC     
LEFT OUTER JOIN ACTM1 ON INC.INCIDENT_NUMBER = ACTM1.NUMBER 
LEFT OUTER JOIN ACTA1 ON ACTM1.THENUMBER = ACTA1.THENUMBER 
LEFT OUTER JOIN (
    SELECT ACTM1_1.NUMBER, ACTM1_1.DATESTAMP AS END_DATESTAMP 
    FROM ACTM1 AS ACTM1_1 
    OUTER APPLY (
     SELECT ACTM1_1_1.NUMBER, /* MIN(ACTM1_1_1.THENUMBER) */ AS FOLLOWUP_THENUMBER 
     FROM ACTM1 AS ACTM1_1_1 
     WHERE (ACTM1_1_1.THENUMBER > ACTM1_1.THENUMBER) 
     AND (ACTM1_1.NUMBER = FOLLOWUP_THENUMBER_TABLE.NUMBER) 
     AND (ACTM1_1_1.[TYPE] IN ('Open', 'Status Change', 'Resolved', 'Closed')) 
    ) AS FOLLOWUP_THENUMBER_TABLE 
) AS END_DATESTAMP_TABLE ON ACTM1.NUMBER = END_DATESTAMP_TABLE.NUMBER 

显然内部查询里面的MIN是没有意义的，虽然。

Answer 2

我会重写查询根本不使用子查询：

SELECT 
    SUM(DATEDIFF(n, A1.datestamp, A2.datestamp)) 

FROM 
    INC AS I 
INNER JOIN ACTM1 AS A1 ON 
    A1.number = INC.incident_number 
INNER JOIN ACTM1 AS A2 ON 
    A2.number > A1.number AND 
    A2.type IN ('Open', 'Status Change', 'Resolved', 'Closed') 
LEFT OUTER JOIN ACTM1 AS A3 ON 
    A3.number > A1.number AND 
    A3.type IN ('Open', 'Status Change', 'Resolved', 'Closed') AND 
    A3.number < A2.number 
WHERE 
    A3.number IS NULL 

我没能完全的反向工程的语句。我不知道你是否需要左连接，我没有看到ACTA1在哪里被实际使用，所以我把它排除了。因此，您可能需要调整上述内容。总体思路是找到一个更大数字的行，它具有您需要的类型，但其中没有其他行（A3）具有正确的类型和落在这两个数字之间的数字。