使用来自两列的数据进行计数[重复]

Question

我有一个进度列和一个电子邮件日期列。我想将 3 个结果作为变量：

First: Progress = 0
Second: Progress = 1, EmailDate == 0000-00-00 00:00:00
Third: Progress = 1, EmailDate !== 0000-00-00 00:00:00

目前我有以下：

SELECT Progress, COUNT(*) AS counter
FROM myTable
GROUP BY Progress

但是，它没有使用电子邮件日期，当我尝试使用它时，我得到一个零值。

Answer 1

SELECT
    SUM(IF(progress = 0,1,0)) AS Counter_1,
    SUM(IF(progress = 1 AND EmailDate = '0000-00-00 00:00:00',1,0)) AS Counter_2,
    SUM(IF(progress = 1 AND EmailDate != '0000-00-00 00:00:00',1,0)) AS Counter_3
FROM myTable