需要在 mysql 查询函数中使用一些限制和排序代码的解决方案
need solutions with some code of limit and order by in mysql query function
我有table这样的
|post_date |post |value |
---------------------------------
|2019-11-05|post |text |
|2019-11-05|post |text |
|2019-11-05|post |text |
|2019-11-05|post |text |
|2019-11-06|post |text |
|2019-11-06|post |text |
|2019-11-07|post |text |
|2019-11-08|post |text |
|2019-11-08|post |text |
|2019-11-08|post |text |
|2019-11-08|post |text |
|2019-11-08|post |text |
|2019-11-08|post |text |
我试过这样select
SELECT post_date, count(*) as post FROM myTable GROUP BY post_date ORDER BY post_date ASC LIMIT 3
会这样显示
|post_date |post |
-----------------------
|2019-11-05|4 |
|2019-11-06|2 |
|2019-11-07|1 |
我需要的就是这个
|post_date |post |
-----------------------
|2019-11-06|2 |
|2019-11-07|1 |
|2019-11-08|6 |
它看起来像是极限 3 的结果。它将从订单中获取最新的 3 个结果,而不是最旧的
只需将您当前的查询包装在一个子查询中,以强加您想要的日期升序:
SELECT
post_date,
post
FROM
(
SELECT post_date, COUNT(*) AS post
FROM myTable
GROUP BY post_date
ORDER BY post_date DESC
LIMIT 3
) t
ORDER BY post_date;
我有table这样的
|post_date |post |value |
---------------------------------
|2019-11-05|post |text |
|2019-11-05|post |text |
|2019-11-05|post |text |
|2019-11-05|post |text |
|2019-11-06|post |text |
|2019-11-06|post |text |
|2019-11-07|post |text |
|2019-11-08|post |text |
|2019-11-08|post |text |
|2019-11-08|post |text |
|2019-11-08|post |text |
|2019-11-08|post |text |
|2019-11-08|post |text |
我试过这样select
SELECT post_date, count(*) as post FROM myTable GROUP BY post_date ORDER BY post_date ASC LIMIT 3
会这样显示
|post_date |post |
-----------------------
|2019-11-05|4 |
|2019-11-06|2 |
|2019-11-07|1 |
我需要的就是这个
|post_date |post |
-----------------------
|2019-11-06|2 |
|2019-11-07|1 |
|2019-11-08|6 |
它看起来像是极限 3 的结果。它将从订单中获取最新的 3 个结果,而不是最旧的
只需将您当前的查询包装在一个子查询中,以强加您想要的日期升序:
SELECT
post_date,
post
FROM
(
SELECT post_date, COUNT(*) AS post
FROM myTable
GROUP BY post_date
ORDER BY post_date DESC
LIMIT 3
) t
ORDER BY post_date;