Question

SELECT ProdName, Sales, 
    1 AS January, 2 AS February, 3 AS March, 4 AS April, 5 AS May, 6 AS June,
    7 AS July, 8 AS August, 9 AS September, 10 AS October,
    11 AS November, 12 AS December 
FROM
(SELECT actsales as Sales , EXTRACT (month from factdate) as Month, ProdName
FROM factcoffee, prodcoffee
WHERE factcoffee.ProductId = prodcoffee.productid) 
PIVOT  
(  
SUM (Sales)  
FOR Month IN  
( 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 )  
);

在第1行中出现Sales的错误。如果仅从第1行中删除销售，则根据需要，我将产品的数据透视表作为行，将月份作为列，但是值不是销售而是一月列仅1个，二月列2个，依此类推。如果在第1行中执行SELECT *，我将按月获得每种产品的正确销售价值。但是列名称显然不是月份名称，而只是1,2，...

Answer 1

您的查询很好，但是请尝试使其更具可读性

SELECT ProdName
, Sales
,[1] AS January
,[2] AS February
,[3] AS March
,[4] AS April
,[5] AS May
,[6] AS June
,[7] AS July
,[8] AS August
,[9] AS September
,[10] AS October
,[11] AS November
,[12] AS December 
 FROM
         (SELECT actsales as Sales , EXTRACT (month from factdate) as Month, 
          ProdName
          FROM factcoffee, prodcoffee
          WHERE factcoffee.ProductId = prodcoffee.productid) 
PIVOT  
(  
SUM (Sales)  
FOR Month IN  
( [1], [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12] )  
) as PVT;

不要忘记将数据透视表重命名为PVT或其他名称。有时代码会因为这样做或忘记括号而失败。

此外，如果您可以尝试使用join代替FROM factcoffee, prodcoffee.，则更具可读性

尝试制作PIVOT表时，我在SQL中收到无效的标识符错误

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