计算来电者总数？

Question

我正在进行此查询以找到拨打电话最多的人:

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

我现在想要的是能够找出总共有多少个独特的来电者.我尝试过使用,DISTINCT但我没有得到任何结果.

Answer 1

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