原版：
curdate()当前日期，无时间
select curdate() - interval (a.a + (10 * b.a) + (100 * c.a) + (1000 * d.a) ) day as day from ( select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as a cross join ( select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as b cross join ( select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as c cross join ( select 0 as a union all select 1 union all select 2 union all select 3 union all select 4 union all select 5 union all select 6 union all select 7 union all select 8 union all select 9) as d 讯享网
查询结果：
从今天开始之前的每一天
把查询的日期换成*你会发现：
变成了1的计时器
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