mysql - 加入没有 WHERE 子句的相同语句

Question

我有下表：

CREATE TABLE posts...
id INT(11),
time DATETIME,
...

而且我想知道一般的最高ID，我还想知道最新的帖子，不考虑最后一小时的帖子，这样我就可以减去它们以获得过去一小时的帖子数。

我可以做两个查询：

SELECT MAX(id) AS old_max FROM posts WHERE time < 
    DATE_SUB(NOW(), INTERVAL 1 HOUR);

和

SELECT MAX(id) AS max FROM posts;

但我想让它们在同一个结果集中。我将如何实现这一目标？

Answer 1

这个怎么样;

SELECT (
SELECT MAX(id) AS old_max FROM posts WHERE time < 
DATE_SUB(NOW(), INTERVAL 1 HOUR)),
(SELECT MAX(id) AS max FROM posts)

Answer 2

试试这个：：

Select 

(SELECT MAX(id) AS max from posts),

(SELECT 
MAX(id) AS old_max 

FROM posts WHERE time < 
    DATE_SUB(NOW(), INTERVAL 1 HOUR));

Answer 3

这也将起作用：

SELECT MAX(id) AS old_max,
    (
        SELECT MAX(id) 
        FROM posts
        ) AS max
FROM posts
WHERE TIME < DATE_SUB(NOW(), INTERVAL 1 HOUR);

Answer 4

这应该工作：

SELECT (
SELECT MAX(id) AS old_max FROM posts WHERE time < DATE_SUB(NOW(), INTERVAL 1 HOUR)),
(SELECT MAX(id) AS max FROM posts)