Sql 连接存储过程中的字符串

我正在从Python调用SQL Server中的一个存储过程。但是，根据Python中的条件，需要传入一个联合字符串

以下是主存储过程查询的外观：

BEGIN
SET NOCOUNT ON;

SELECT      
    mbh.id,
    COALESCE(oc.DowntimeReasonLevel1Name, 'Nothing for Now') AS 'DowntimeReasonLevel1Name',
    COALESCE(osw.DowntimeReasonLevel2Name, 'Nothing for Now') AS 'DowntimeReasonLevel2Name',
    CAST(SUM(DATEDIFF(SECOND, de.start_time, de.end_time))/60.0 AS decimal (8,2)) as Duration
FROM    
    mixer_downtime_event mde
JOIN 
    downtime_event de ON de.id = mde.downtime_event_id
JOIN 
    oee_status_word osw ON osw.id = de.oee_status_word_id
JOIN 
    oee_category oc ON oc.id = osw.oee_category_id
JOIN 
    mixer_batch_history mbh ON mbh.id = mde.mixer_batch_history_id
JOIN 
    compound_process cp ON cp.id = mbh.compound_process_id
JOIN 
    compound c ON c.id = cp.compound_id
WHERE 
    mde.mixer_batch_history_id IN (@IdList)
    AND osw.id <> 9000
    AND DATEDIFF(MINUTE, de.start_time, de.end_time) > 0
GROUP BY 
    mbh.id, DowntimeReasonLevel1Name, DowntimeReasonLevel2Name
--+
--@downtimeUnion
END

或者可以是空白字符串

---

如何在存储过程中将此查询连接在一起？

将

@Duration

作为参数传递，然后添加：

UNION ALL
SELECT NULL,
       'Changeover' AS DowntimeReasonLevel1Name,
       'Changeover' AS DowntimeReasonLevel2Name,
        @Duration as Duration

如果希望这是有条件的，那么可以让

@Duration

作为条件的标志执行双重任务：

UNION ALL
SELECT NULL,
       'Changeover' AS DowntimeReasonLevel1Name,
       'Changeover' AS DowntimeReasonLevel2Name,
        v.Duration as Duration
FROM (VALUES (@Duration)) v(Duration)
WHERE v.Duration IS NOT NULL;

---

你不能。您现有的查询有四列，而传入的值仅占三列。@GordonLinoff，对不起，忘记更新查询的这一部分，我没有使用mbh.id，因此它的两端最终将具有相同的列数。！！我遇到的问题是将整个联合部分与主查询连接在一起。因为，它必须是完全动态的！（根据条件，我可以将转换或试验等列为一列）

UNION ALL
SELECT NULL,
       'Changeover' AS DowntimeReasonLevel1Name,
       'Changeover' AS DowntimeReasonLevel2Name,
        v.Duration as Duration
FROM (VALUES (@Duration)) v(Duration)
WHERE v.Duration IS NOT NULL;