MySQL DELETE with JOIN 使用 LIMIT 语句获取语法错误

Question

我正在运行查询来删除重复的条目。它无需 LIMIT 语句即可工作，但会使服务器过载。我想使用 LIMIT 语句对其进行批处理。

DELETE t1
FROM data as t1
join data as t2
WHERE t1.type = t2.type
AND t1.timestamp = t2.timestamp
LIMIT 100

使用 LIMIT 语句会收到错误:

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'LIMIT 100' at line 6

Answer 1

您不能直接使用可以在选择中使用的删除限制

  DELETE data 
  FROM data as t1
  join (
        select distinct type, timestamp from data limit 100  
  ) t2  on t1.type = t2.type AND t1.timestamp = t2.timestamp