計算主叫方總數？

Question

目前，我正在做這個查詢找到誰使大多數呼叫的傢伙：

SELECT 
    `commenter_name`, 
    COUNT(*) AS `calls` 
FROM `comments` 
GROUP BY `commenter_name` 
ORDER BY `calls` LIMIT 1 

我現在要的是能找出多少總獨特的來電。我嘗試使用DISTINCT，但我沒有得到任何地方。

Answer 1

SELECT COUNT(DISTINCT 'commenter_name') FROM 'comment'; 

Answer 2

SELECT DISTINCT `commenter_name` FROM `comments` 

Answer 3

SELECT COUNT（*）FROM（選擇從註釋DISTINCT COMMENTER_NAME）作爲CmtCnt;