选择满足条件的最后一行

Question

我有一个数据库，我想输出POSITION为49且ID最高的行的VAL。我有这段代码，但是我不确定从这里去哪里。

SELECT ID, POSITION,
CASE WHEN POSITION = 49 THEN VAL END
FROM Log

Answer 1

最简单的解决方案是

SQL-SERVER

SELECT top 1 val
FROM Log
where position = 49
order by id desc

MySQL

   SELECT val
    FROM Log
    where position = 49
    order by id desc
    limit 1