Question

我在cte中使用列别名进行连接时遇到问题。与Invalid column name一致的RowNumber2 >= (t1.RowNumber - 20)任何人都有建议吗？感谢..

DECLARE @latestDate Date = dbo.LatestDateWithPricingVolCountOver4k()

;WITH AllSymbsAndDates AS
(
    SELECT 
        ROW_NUMBER() OVER (PARTITION BY Symbol ORDER BY TradingDate) AS RowNumber, 
        Symbol, TradingDate
    FROM tblSymbolsMain 
    CROSS JOIN tblTradingDays
    WHERE TradingDate <= @latestDate
),
SymbsDatesGrouped AS
(
    SELECT * FROM
    (
        SELECT 
            t1.Symbol, t1.TradingDate, t2.TradingDate AS TradingDate2, t1.RowNumber, 
            t2.RowNumber AS RowNumber2
        FROM AllSymbsAndDates t1 
        JOIN AllSymbsAndDates t2 ON t1.Symbol = t2.Symbol 
            AND RowNumber2 >= (t1.RowNumber - 20)
    ) t
)
SELECT 
    Symbol, TradingDate, TradingDate2, RowNumber, RowNumber2
FROM 
    SymbsDatesGrouped
ORDER BY 
     Symbol, TradingDate, TradingDate2

Answer 1

您无法在WHERE或JOIN子句中引用列别名 - 实际上，您可以在SELECT列表中引用别名的唯一子句位于ORDER BY（或者在外部范围内，例如从子查询或CTE中选择。）

在这种情况下，解决方案非常简单。为什么不说：

 AND t2.RowNumber >= (t1.RowNumber - 20)

错误“CTE中的列名无效”

1 个答案: