在内联查询之外的 Where 子句中使用内联查询别名答案

【问题标题】：Using Inline Query Alias in Where clause outside of inline Query在内联查询之外的 Where 子句中使用内联查询别名
【发布时间】：2019-07-26 13:27:35
【问题描述】：

我已经看到了解决方案，链接sql using query alias in where clause，但对我没有多大帮助。

我的问题是如何在 where 子句中使用内联别名进行外部查询，因为我在 where 条件的外部查询中使用内联别名收到错误消息。

我的查询是-

USE db_Stock_Market;
    GO
    SELECT * FROM STOCK_DATA_FOR_ANALYSIS
    --The days where there is 2% or more drop
    SELECT * FROM (
        SELECT 
            Date, Symbol, LEAD(BID_Open) OVER (ORDER BY Date) AS Purchase_price, 100/LEAD(BID_Open) OVER (ORDER BY Date) AS Shares,
            (BID_Close-BID_Open)/BID_Open AS Day_Return, 100 AS Purchase
                FROM STOCK_DATA_FOR_ANALYSIS
                   )
                    WHERE Day_Return< -0.02

错误信息-

消息 156，级别 15，状态 1，第 11 行关键字“WHERE”。

【问题讨论】：

标签： sql sql-server sql-server-2012 alias

【解决方案1】：

您缺少派生表别名

SELECT * FROM (
        SELECT 
            Date, Symbol, LEAD(BID_Open) OVER (ORDER BY Date) AS Purchase_price, 100/LEAD(BID_Open) OVER (ORDER BY Date) AS Shares,
            (BID_Close-BID_Open)/BID_Open AS Day_Return, 100 AS Purchase
                FROM STOCK_DATA_FOR_ANALYSIS
)A WHERE Day_Return< -0.02

【讨论】：

【解决方案2】：

试试这个：

 USE db_Stock_Market;
GO
SELECT * FROM STOCK_DATA_FOR_ANALYSIS
--The days where there is 2% or more drop
SELECT * FROM (
    SELECT 
        Date, Symbol, LEAD(BID_Open) OVER (ORDER BY Date) AS Purchase_price, 
        100/LEAD(BID_Open) OVER (ORDER BY Date) AS Shares,
        (BID_Close-BID_Open)/BID_Open AS Day_Return, 
        100 AS Purchase
    FROM STOCK_DATA_FOR_ANALYSIS
    ) as X
WHERE Day_Return< -0.02

【讨论】：