SQL逻辑问题，可用于我的临时表

Question

我在使用哪种SQL逻辑时遇到问题，以便在临时表中找到政策编号（第2列），例如EAB1507017，在余额为0.00（第7列，最后一秒）。您会注意到列出的第二项策略EAB1507600已正确完成，但EAB1507017却未完成，我正在此临时表中查找那些在输入“代理退款”条目之前，运行余额为0的记录。

这是我的SQL代码：

SELECT glJournalID, PolicyNo, Description, IsReceipt, TransactionDate, TransactionAmount, 
SUM(TransactionAmount) OVER (PARTITION BY PolicyNo ORDER BY glJournalID asc ROWS UNBOUNDED PRECEDING) as RunningBalance, 
UserID
FROM #tmpTableResults
ORDER BY PolicyNo asc, glJournalID asc;

任何帮助/指导将不胜感激。谢谢。

Answer 1

未经测试，但是我认为这将为您提供独特的PolicyNo，在余额为'Agent Refund'之后立即具有0.00。关键是使用ROW_NUMBER()，以便为每个PolicyNo创建一个无间隙的序列，使您可以进行精确的前瞻或后瞻。

WITH T AS (
    SELECT 
        PolicyNo, 
        SUM(TransactionAmount) OVER (
            PARTITION BY PolicyNo 
            ORDER BY glJournalID asc 
            ROWS UNBOUNDED PRECEDING
        ) AS RunningBalance,
        Description,
        ROW_NUMBER() OVER(PARTITION BY PolicyNo ORDER BY glJournalID) AS RowNum
    FROM #tmpTableResults
)
SELECT DISTINCT T.PolicyNo
FROM T
INNER JOIN T T2
    ON 
        T2.PolicyNo = T.PolicyNo
        AND T2.RowNum = T.RowNum + 1
        AND T2.Description = 'Agent Refund'
WHERE T.RunningBalance = 0.00