mysql根据date做年,月,日分组统计查询

- 使用 YEAR(), MONTH(), DAY() 来获取年月日 
SELECTYEAR(application_date) as years, count(1) FROM patent GROUPBYYEAR(application_date) ORDERBY years
-- YEAR(application_date)   获取年份
-- MONTH(application_date) 获取月份
-- DAY(application_date)    获取日
- 使用 date_format(application_date,"%Y"),可自定义日期格式
SELECT date_format(application_date, "%Y") asyear, count(1) FROM patent GROUPBY date_format(application_date, "%Y")
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