题解 | #计算用户8月每天的练题数量#

-- SQL自带的DAY(),MONTH(),YEAR()函数计算'2021-08-13'类型值的年月日数据
SELECT
    DAY(date) AS day,
    COUNT(question_id) AS question_cnt
FROM question_practice_detail
WHERE date LIKE '2021-08%'
GROUP BY date