mysql怎麼根據date做年，月，日分組統計查詢

使用YEAR(), MONTH(), DAY() 來取得年月日

SELECT YEAR(application_date) as years, count(1) FROM patent GROUP BY YEAR(application_date) ORDER BY 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')，可自訂日期格式

SELECT date_format(application_date, "%Y") as year, count(1) FROM patent GROUP BY date_format(application_date, "%Y")

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