验证表的内容

Question

我的数据库中有一张表，我正在尝试从表中验证每一个细节，到目前为止，我已经获得了每年的月数和每个月的天数，我正在尝试挖掘到目前为止，通过获取每个月每天的小时数，这是我的代码。

SELECT year, month, COUNT(day) as CountOfDaysForThisMonth
FROM
(
SELECT DISTINCT YEAR(timestamp) AS year, 
MONTH(timestamp) AS month, 
DAY(timestamp) AS day
FROM TimestampTable
)
GROUP BY year, month;