编写一个返回与特定用户相关的最新行的查询

Question

尝试创建一个获取与用户相关的最新记录的查询。这是我的尝试

"SELECT * 
 FROM (
    SELECT *
    FROM mytable
    ORDER BY id
    DESC LIMIT 1)
 WHERE userid = $userID";

Answer 1

你也可以：

Select * from table 
Where id =
   (Select Max(Id) from table
    where userid = $userID)

Answer 2

只需跳过子查询：

SELECT * 
FROM  mytable
WHERE userid = $userID
ORDER BY id DESC
LIMIT 1

Answer 3

使用热门（1）

Select TOP(1) * FROM table  ORDER BY id DESC

Answer 4

尝试：

SELECT *
    FROM mytable
    WHERE userid = $userID
    ORDER BY id DESC
    LIMIT 1