更新查询：子查询返回超过 1 个值

Question

我正在尝试使用从另一个表 (incomestatement) 中提取的信息更新表 (Yahoostockdata))，具体取决于日期。

Yahoostockdata 包含雅虎每天的价格，我想根据incomestatement 中针对该特定日期的最实际可用信息添加每个日期的股票数量。

运行查询时（没有更新），我得到了我想要的所有数字。除了，添加UPDATE 语句时，我收到错误消息：suquery 返回超过 1 个值。

消息 512，第 16 级，状态 1，第 1 行 子查询返回超过 1 个值。当子查询跟随 =、!=、、>= 或子查询用作表达式时，这是不允许的。声明已终止。

谁能帮我解决这个问题？我已经看过相关的问题，但找不到答案。先感谢您。在我正在使用的代码下方：

Update YahooStockData
Set NumberOfShares = (Select [Weighted average shares outstanding (Diluted)]
   from (Select *,ROW_NUMBER() over (partition by derived_1.MorningstarTicker,
             derived_1.[date] order by derived_1.AsOfDate desc) as RN
         from (Select Yahoostockdata.YahooTicker, IncomeStatement.MorningstarTicker,
               yahoostockdata.[Date], AsOfDate, 
               Incomestatement.[Weighted average shares outstanding (Diluted)]
               from IncomeStatement INNER JOIN
                  YahooStockData ON IncomeStatement.MorningstarTicker = YahooStockData.MorningstarTicker
         Where  YahooStockData.[Date] >= AsOfDate) as derived_1) as derived_2
    Where RN = 1)

Answer 1

这可以进一步清理，但我相信这就是你所追求的：

;WITH cte AS (Select MorningstarTicker,[Weighted average shares outstanding (Diluted)]
                from (Select *,ROW_NUMBER() over (partition by derived_1.MorningstarTicker,
                             derived_1.[date] order by derived_1.AsOfDate desc) as RN
                      from (Select Yahoostockdata.YahooTicker, IncomeStatement.MorningstarTicker,
                                    yahoostockdata.[Date], AsOfDate, 
                                    Incomestatement.[Weighted average shares outstanding (Diluted)]
                            from IncomeStatement 
                            INNER JOIN   YahooStockData ON IncomeStatement.MorningstarTicker = YahooStockData.MorningstarTicker
                            Where  YahooStockData.[Date] >= AsOfDate
                            ) as derived_1
                    ) as derived_2
                Where RN = 1)
                )
UPDATE a
SET a.NumberofShares = b.[Weighted average shares outstanding (Diluted)]
FROM YahooStockData a
JOIN cte b
  ON a.MorningstarTicker = b.MorningstarTicker

我已将 MorningstartTicker 添加到您的子查询中，并将整个位放入 cte 中，以使带有 JOIN 的 UPDATE 更易于查看。

原始查询的问题在于您试图用一个值更新每条记录，因为它们与子查询无关。

Answer 2

试试这个

UPDATE A
SET    NumberOfShares = B.[Weighted average shares outstanding (Diluted)]
FROM   YahooStockData A
       JOIN (SELECT [Weighted average shares outstanding (Diluted)],
                    derived_2.MorningstarTicker
             FROM   (SELECT *,
                            Row_number() OVER ( partition BY  derived_1.MorningstarTicker, derived_1.[date]
                                ORDER BY derived_1.AsOfDate DESC) AS RN
                     FROM   (SELECT Yahoostockdata.YahooTicker,
                                    IncomeStatement.MorningstarTicker,
                                    yahoostockdata.[Date],
                                    AsOfDate,
                                    Incomestatement.[Weighted average shares outstanding (Diluted)]
                             FROM   IncomeStatement
                                    INNER JOIN YahooStockData
                                            ON IncomeStatement.MorningstarTicker = YahooStockData.MorningstarTicker
                             WHERE  YahooStockData.[Date] >= AsOfDate) AS derived_1) AS derived_2
             WHERE  RN = 1) B
         ON A.MorningstarTicker = B.MorningstarTicker