How to find percentage on in SQL?

I have data like this:

I want to find the percentage as a third column for each row, No- 549/(549+342)
Yes – 342/(549+342)

I have tried select Survived, cnt, round(100*(cnt/sum(cnt)), 2) as prcntage from survivalCnt
and also with grouping but nothing seems to work,
I also tried with Partitioning.

Can someone help me, I know its a simple problem, I can’t seem to pin point the answer

>Solution :

you need a subquery to run the calculation

SELECT
    Survived,
    cnt,
    (cnt * 100.0 / (SELECT SUM(cnt) FROM survival_data)) AS "%"
FROM
    survival_data;