MySQL实现按天分组统计，提供完整日期列表，无数据自动补0

2、业务统计查询也按上述日期查询给统计日期和数量设置别名

SELECT
    FROM_UNIXTIME(m.sdate, ‘%Y-%m-%d‘) as date_str, count( * ) as date_count
from t_table1 as m
group by FROM_UNIXTIME(m.sdate, ‘%Y-%m-%d‘)

3、把两个查询用左连接合起，没数量的日期填0

SELECT t1.date_str, COALESCE(t2.date_total_count, 0) as date_total_count
FROM(
    SELECT @cdate: = date_add(@cdate, interval - 1 day) as date_str FROM(SELECT @cdate: = date_add(CURDATE(), interval + 1 day) from t_table1) tmp1 WHERE @cdate > ‘2018 - 12 - 01‘
) t1
LEFT JOIN(
    SELECT FROM_UNIXTIME(m.sdate, ‘%Y-%m-%d‘) as date_str, count(*) as date_total_count FROM t_table1 as m WHERE m.sdate between XXXX and XXXXX GROUP BY FROM_UNIXTIME(m.sdate, ‘%Y-%m-%d‘)
) t2
on t1.date_str = t2.date_str

查询结果如下图所示：

MySQL实现按天分组统计，提供完整日期列表，无数据自动补0

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