mysql - 计算百分比但出现语法错误

Question

当我尝试时，请帮我查看这段代码，我收到语法错误。

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'**,** 后面多了一个逗号，是拼写错误还是故意的？这个逗号应该被删除，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;