计算百分比，但我得到语法错误

Question

请在尝试时查看此代码，我会收到语法错误。

SELECT Category,  
    COUNT(*) AS Total, 
    (COUNT(*) / (SELECT COUNT(*) FROM Item WHERE Department='Popular')) * 100
    AS 'Percentage to all items', 
FROM Item
WHERE Department='Popular'
GROUP BY Category;

Answer 1

'Percentage to all items'**,**后有一个额外的逗号，是错字还是有意？应删除此逗号，然后尝试plz：）

所以sql应该是：

SELECT Category, COUNT(*) AS Total , 
    (COUNT(*) / (SELECT COUNT(*) FROM Item WHERE Department='Popular')) * 100 AS 'Percentage to all items'
    FROM Item WHERE Department='Popular' GROUP BY Category;