Deloitte SQL Interview Question 2024 | Cases that reached each stage of completion for each center

[@ishanshubham8355]

I tried solving it on MYSQL
with cte as (
Select *,
concat_ws(",",stage1,stage2,stage3,stage4,stage5) as cnct1,
concat_ws(",",stage2,stage3,stage4,stage5) as cnct2,
concat_ws(",",stage3,stage4,stage5) as cnct3,
concat_ws(",",stage4,stage5) as cnct4,
concat_ws(",",stage5) as cnct5
from CaseProgress)
select center_id,
sum(if(length(cnct1)0,1,0)) as stage1,
sum(if(length(cnct2)0,1,0)) as stage2,
sum(if(length(cnct3)0,1,0)) as stage3,
sum(if(length(cnct4)0,1,0)) as stage4,
sum(if(length(cnct5)0,1,0)) as stage5
from cte
group by 1