mysql查询近30天

Posted 2023-02-04 疯狂小公举

mysql查询近30天

但是存在bug
SELECT @cdate := date_add( CURDATE( ), INTERVAL 1 DAY ) FROM 表 LIMIT 30
这一句sql中会看这个表是否有30条，若没有查询最终结果将有误
这个表有几条查询的最终结果就有几条
如何解决：
把上面sql的表换成包含30条数据的表即可

SELECT
	b.created AS time,
	COUNT( id ) AS num 
FROM
	(
	SELECT
		@cdate := date_add( @cdate, INTERVAL - 1 DAY ) created 
	FROM
		( SELECT @cdate := date_add( CURDATE( ), INTERVAL 1 DAY ) FROM lcy_serv_base_info LIMIT 30 ) a 
	) b
	LEFT JOIN ( SELECT * FROM lcy_serv_base_info WHERE is_del = '0' ) c ON b.created = date_format( c.created, '%Y-%m-%d' ) 
	AND c.run_status = '1' 
GROUP BY
	b.created 
ORDER BY
	b.created;