Question

DECLARE @Sample TABLE(@x float, @y float)

SET @x = SELECT [Return] x 
         FROM [return] 
         WHERE YM BETWEEN 8801 AND 8901 
           AND Radif = 2

SET @y = SELECT [Return] y 
         FROM [return] 
         WHERE YM BETWEEN 8801 AND 8901 
           AND Radif = 2

;WITH cteSource(x, xAvg, y, yAvg, n) AS 
(
    SELECT  
        1E * x,
        AVG(1E * x) OVER (PARTITION BY (SELECT NULL)),
        1E * y,
        AVG(1E * y) OVER (PARTITION BY (SELECT NULL)),
        COUNT(*) OVER (PARTITION BY (SELECT NULL))
    FROM    
        @Sample
)
SELECT  
    SUM((x - xAvg) *(y - yAvg)) / MAX(n) AS [COVAR(x,y)]
FROM
    cteSource

Answer 1

它可能有多个错误。但从前三行开始没有任何意义：

DECLARE @Sample  table( @x float , @y float)
        set @x = SELECT [Return]x FROM  [return] where  YM between 8801 and 8901 and Radif=2
        set @y = SELECT [Return]y FROM  [return] where  YM between 8801 and 8901 and Radif=2;

我最近能猜到，你想要这样的东西：

DECLARE @Sample  table(x float, y float);
INSERT INTO @Sample(x, y )
    SELECT x, y
    FROM [return] 
    WHERE YM between 8801 and 8901 and Radif = 2;

（这可能不是你想要的。这只是猜测。）

前三行有很多错误，我最好的建议就是了解T-SQL编码和SQL语法。

该程序有错误。有人可以帮我解决吗？

1 个答案: