ORA-00905: missing keyword is coming for this code

Question

select employee_id,case first_name when first_name = "Steve" then "My name is Steve" 
                        else first_name
end
from hr.employees
where 
employee_id = 150;

Please rectify this error for me

Answer 1

It's just a type. Instead of case first_name when first_name = "Steve" you need to use case when first_name = 'Steve' or case first_name when 'Steve'

select employee_id,case when first_name = 'Steve' then 'My name is Steve' 
                        else first_name
end as First_Name
from hr.employees
where 
employee_id = 150;