Question

SELECT 
    user_id, 
    unix_timestamp, 
    LAG(unix_timestamp,1) OVER (PARTITION BY user_id ORDER BY unix_timestamp) 
    As Previous_time
FROM mydb.query_one
LIMIT 5;

错误代码：1064。您的SQL语法有错误;查看与您的MySQL服务器版本相对应的手册，以便使用正确的语法（＃PARTITION BY user_id ORDER BY unix_timestamp）AS previous_time，RO＆＃39;在第5行第0.056秒

Answer 1

MySQL仅支持从8.0版开始的窗口函数。相反，你可以这样做：

SELECT qo.user_id, qo.unix_timestamp, 
       (SELECT MAX(qo2.unix_timestamp) 
        FROM mydb.query_one qo2
        WHERE qo2.user_id = qo.user_id AND qo2.unix_timestamp < qo.unix_timestamp
       ) as Previous_time
FROM mydb.query_one
LIMIT 5;

任何人都可以告诉这个mysql代码有什么问题吗？

1 个答案: