如何重写查询

Question

我需要以优化的方式重写查询，任何人都可以帮我这样做吗？

DELETE FROM test WHERE TO_DAYS(NOW()) - TO_DAYS(START_TIME) > 30;

start_time列为date time not null

Answer 1

假设您要删除超过30天的记录，这是我能想到的效率最高的WHERE：

DELETE FROM test
WHERE START_TIME < NOW - INTERVAL 30 DAY

Answer 2

试试这个：

DELETE FROM TEST WHERE DATEDIFF(CURDATE(),Start_time))>30
FROM TABLE1

希望这会有所帮助..