1. Get the number of days in a certain period. 2018-05-03: final time, 10: days
1 SELECT @cdate := date_add(@cdate, INTERVAL - 1 DAY) '时间' FROM (SELECT @cdate := '2018-05-03' FROM tenant_pv LIMIT 10) t1
Results of the:
2. Statistics by day
1 SELECT 2 times AS '时间', 3 count(id) AS '数量' 4 FROM 5 ( 6 SELECT 7 @cdate := date_add(@cdate, INTERVAL - 1 DAY) times 8 FROM (SELECT @cdate := '2018-05-03' FROM tenant_pv LIMIT 10) t1 9 ) AS dates 10 LEFT JOIN ( 11 SELECT 12 tp.id, 13 tp.createTime 14 FROM 15 tenant_pv tp 16 LEFT JOIN sys_tenant sy ON sy.id = tp.tenantId 17 ) p ON DATE_FORMAT(createTime, '%Y-%m-%d') = dates.times 18 GROUP BY 19 times
Results of the: