嗨，我有查询建立在DB Fiddle，MySql 8.0，我想看看执行时间.我不知道如何在这个工具上做到这一点.有人可以帮助下面的查询？

select a.e_id from 
(
select *,
DENSE_RANK() OVER(PARTITION by e_id ORDER BY start_date desc)rk,
count(*) over(partition by e_id) as company_ct
from employment
order by e_id asc,start_date desc
)a
where a.rk=1 and a.company_ct>1;

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