我想运行这样的查询
select ... as days where `date` is between '2010-01-20' and '2010-01-24'
并返回如下数据:
days ---------- 2010-01-20 2010-01-21 2010-01-22 2010-01-23 2010-01-24
最佳答案
此解决方案不使用循环、过程或临时表。子查询生成最近 10,000 天的日期,并且可以扩展到您希望的任何时间。
select a.Date
from (
select curdate() - INTERVAL (a.a + (10 * b.a) + (100 * c.a) + (1000 * d.a) ) DAY as Date
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
) a
where a.Date between '2010-01-20' and '2010-01-24'
输出:
Date
----------
2010-01-24
2010-01-23
2010-01-22
2010-01-21
2010-01-20
性能说明
正在测试 here ,性能出奇的好:上面的查询需要 0.0009 秒。
如果我们扩展子查询来生成大约。 100,000 个数字(因此约有 274 年的日期),它在 0.0458 秒内运行。
顺便说一句,这是一种非常便携的技术,只需稍作调整即可适用于大多数数据库。
关于sql - 从日期范围生成天数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56844222/