SQL 个早于日期的 table 交易，但最近没有

Question

我有两个 table，InvMaster 和 InvMovements。我需要找到所有早于 x 个月的移动，但仅限于自 x 个月以来没有移动的行。主要日期字段是 InvMovements.EntryDate

InvMovements 是所有库存交易的集合。 StockCode 在 InvMaster table 中当然是唯一的，在 InvMovements 中是 1 对多。

这是我到目前为止整理的内容。

SELECT Inv.StockCode, MAX(Inv.EntryDate) as EntryDt
FROM InvMaster AS IM 
LEFT JOIN InvMovements AS Inv 
  ON IM.StockCode = Inv.StockCode 
--This gets us all the rows that have had JX transactions in the last x months 
RIGHT JOIN (SELECT IM.StockCode, MAX(IMv.EntryDate) As EntryDate 
            FROM InvMaster AS IM 
            LEFT JOIN InvMovements AS IMv 
              ON IM.StockCode = IMv.StockCode
            WHERE IMv.StockCode LIKE 'JX%' 
              AND IMv.EntryDate >= DATEADD(m, (-24), GETDATE())  
               OR IMv.EntryDate IS NULL
            GROUP BY IM.StockCode) AS MovedStock 
  ON MovedStock.StockCode != Inv.StockCode 
WHERE Inv.StockCode LIKE 'JX%' 
  AND Inv.EntryDate <= DATEADD(m, (-24), GETDATE()) 
   OR IM.StockCode LIKE 'JX%' AND Inv.EntryDate IS NULL
GROUP BY Inv.StockCode

Answer 1

听起来您只需要在 WHERE 条件中使用 NOT EXISTS。

我试着清理一下你的 where 条件，因为它对我来说没有意义。

SELECT  IM.StockCode,
        MAX(Inv.EntryDate) AS EntryDt
FROM    InvMaster AS IM
        LEFT JOIN InvMovements AS Inv ON IM.StockCode = Inv.StockCode 
WHERE   IM.StockCode LIKE 'JX%'
        AND (Inv.EntryDate <= DATEADD(m,(-24),GETDATE())
                OR Inv.EntryDate IS NULL)
        AND NOT EXISTS (
            SELECT  1
            FROM    InvMovements AS MovedStock
            WHERE   IM.StockCode = MovedStock.StockCode
                    AND MovedStock.EntryDate >= DATEADD(m,(-24),GETDATE())
        )
GROUP BY IM.StockCode

Answer 2

您想要 JX 股票代码早于特定月数的所有变动，但前提是它们在特定月数后没有变动。对于此示例，它将为您提供超过 6 个月的移动（WHERE CLAUSE），但前提是它们在最近 3 个月内没有移动（HAVING CLAUSE）。如果您真的希望这些数字始终相同，只需使用相同的变量即可。

DECLARE @olderThanMonths TINYINT = 6
    ,@sinceMonths TINYINT = 3

SELECT Inv.StockCode, MAX(Inv.EntryDate) as EntryDt
FROM InvMovements AS MO
    JOIN InvMaster AS MA
        ON MO.StockCode = MA.StockCode
WHERE MO.EntryDate <= DATEADD(MONTH,@olderThanMonths,GETDATE())
    AND MA.StockCode LIKE 'JX%'
GROUP BY Inv.StockCode
HAVING MAX(Inv.EntryDate) <= DATEADD(MONTH,@sinceMonths,GETDATE())

SQL 个早于日期的 table 交易，但最近没有

SQL transactions within a table older than date, but doesn't have any lately

tsql

sql-server

self-join