按条件使用Group BY查询列计数

Question

表格结构

id(int)
dated_on(datetime)
(many_more)

包含数千个按ID分组的数据的表。

I want result as id, count of that id, 
also count of id having date difference is week.(i.e. count of data last week)

Answer 1

select
id,
count(id) as cnt,
sum(if(now() - interval 7 day <= dated_on,1,0)) as lastweek
from table
group by id

Answer 2

SELECT
  id,
  COUNT(*),
  SUM(CASE WHEN dated_on = CURDATE() - 7 THEN 1 ELSE 0 END)
FROM
  yourTable
GROUP BY
  id

Answer 3

我也有解决方案：

SELECT id, count(id) as counter, 
COUNT(CASE WHEN DATEDIFF( CURDATE(), dated_on ) < 7 THEN 1 ELSE NULL END) AS latest_count
FROM my_table
GROUP BY id