我的表中有 20 万个数据。我只想访问 40 个数据。在这里,问题是何时触发以下查询
select a.* from
(select
row_number() over (ORDER BY columnid1) as srno,*
from table
where
columnid1 between 1 and 20
and columnid2 like '%A%'
and columnid3 between 20 and 25
) as a
where a.srno>=5200 and a.srno<=5240
然后在 12 秒后给出结果。
如何提高我的访问速度?