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。我尝试使用DISTINCT，但我没有到达任何地方。

Answer 1

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

Answer 2

SELECT DISTINCT `commenter_name` FROM `comments`

Answer 3

选择Count（*）From（从注释中选择DISTINCT commenter_name）作为CmtCnt;