SELECT weight AS weight_delta
from (select max(weight)
from patients
where last_name='Maroni')
-
(select min(weight)
from patients
where last_name='Maroni'); Copyright 2014-2025 https://www.php.cn/ All Rights Reserved | php.cn | 湘ICP备2023035733号
你想得太复杂了。无需任何子查询即可找到差异: