如果命中字段值，则重置运行总计

Question

我可以使用以下查询保持运行总计，并且它就可以了。我真正想要的是，当间隙字段大于或等于date_diff字段时，运行总计应该重置回当前的hrly_qty。我确信我可以用光标实现我的结果，但我想知道可能的其他方法。想法？

示例：

WITH CTE AS
    (
        SELECT a.*, SUM(b.hrly_qty) AS running_total, c.gap 
        FROM #tmpTrxhist2 a
            INNER JOIN #tmpTrxhist2 b ON a.people_id = b.people_id 
                                      AND b.sequence_id <= a.sequence_id
            INNER JOIN incent_level c ON a.owner_division_id = c.owner_division_id
        GROUP BY a.date_diff, a.owner_division_id, a.people_id, a.sequence_id, 
                 a.hrly_qty, c.gap
    )
SELECT * FROM CTE
ORDER BY people_id, sequence_id

Answer 1

你很少需要光标！一个简单的案例陈述就足够了。在我的头脑中有类似的东西：

WITH CTE AS
    (
        SELECT a.*, SUM(b.hrly_qty) AS running_total, c.gap 
        FROM #tmpTrxhist2 a
            INNER JOIN #tmpTrxhist2 b ON a.people_id = b.people_id 
                                      AND b.sequence_id <= a.sequence_id
            INNER JOIN incent_level c ON a.owner_division_id = c.owner_division_id
        GROUP BY a.date_diff, a.owner_division_id, a.people_id, a.sequence_id, 
                 a.hrly_qty, c.gap
    )
SELECT *,

CASE
     WHEN gap >= date_diff then hrly_qty else gap
END as comp_gap

 FROM CTE
ORDER BY people_id, sequence_id

在两者之间运行执行计划，但SQL尝试优化非游标代码几乎总是更快乐。至少在我的领域，你通常会发现游标被“适当的”C / C ++程序员过度使用和滥用，因为当看到看似有点像while循环而不是考虑数据集的东西时，它们会进入他们的舒适区域。有一个游标的地方，但这不是它！