Question

我有一个新闻表，然后我使用foreach循环回显到一个滑块。我需要调整查询的排序顺序，因此最后添加的（max id）总是先显示，其他的按id ASC排序。

例如：新闻1,2,3,4。我需要它们像4,1,2,3一样回应。

SELECT * FROM news ORDER BY sort ASC

如何首先以max（id）的形式添加另一个条件然后对ASC进行排序？

感谢。

Answer 1

您可以尝试此查询：

SELECT *
FROM (
   SELECT *,
         (SELECT MAX(Id) FROM news) AS max_id 
   FROM news) AS t
ORDER BY CASE WHEN id = max_id THEN 0 ELSE 1 END asc,
         id ASC

或使用CROSS JOIN：

SELECT n.*
FROM news AS n
CROSS JOIN (SELECT MAX(Id) AS max_id FROM news) AS m
ORDER BY CASE WHEN n.id = m.max_id THEN 0 ELSE 1 END asc,
         n.id ASC

Answer 2

或使用窗口功能

SELECT *
FROM (
    SELECT *, ROW_NUMBER() OVER (ORDER BY id DESC) AS RN
    FROM news) AS T
ORDER BY CASE WHEN RN = 1 THEN 0 ELSE 1 END, id

SELECT *
FROM (
    SELECT *, MAX(id) OVER () AS MaxID
    FROM news) AS T
ORDER BY CASE WHEN MaxID = id THEN 0 ELSE 1 END, id

SQL查询首先显示最新值，然后显示其他ASC

2 个答案: