總結在MySQL

Question

列的值我有一個表「成果」具有下列數據

id a 
123 apple 
223 orange 
646 apple 
757 banana 
876 kiwi 
989 orange 

我想編寫一個MySQL將總結列的出現次數「一」，並將它們放入3獨立的水桶：一個蘋果，一個桔子，其餘下的「其他」

SELECT 
    count(*) as total 
    sum(if(a = 'apple',1,0)) as applecount 
    , sum(if(a = 'orange',1,0)) as orangecount 
    , sum(`applecount` + `orangecount` - total) as others 

FROM fruits 

但在運行查詢，提供了以下錯誤的字段列表 未知列「applecount」

Answer 1

SELECT count(*) as total, 
     sum(a = 'apple') as applecount, 
     sum(a = 'orange') as orangecount, 
     sum(a not in ('orange', 'apple')) as others 
FROM fruits 

SQLFiddle example