Mysql按日期分组并计数查询

Question

我有如下表格:-

借助 MySql 查询，我想要如下结果:

date        total    read    unread
2018-01-31   8        4        4
2018-02-01   2        2        0

Answer 1

试试这个:

SELECT date, COUNT(*) as total,
SUM(CASE WHEN read = 1 THEN 1 ELSE 0) as read
SUM(CASE WHEN read = 0 THEN 1 ELSE 0) as unread
FROM yourtable
GROUP BY date