Arithmetic addition to aggregate function

I’m new to sql and wanted to perform a simple task using aggregate function in sql.

select  (current_data + avg(current_data)) 
as "average + current data"
from datasets

​x
 
select  (current_data + avg(current_data)) as "average + current data"from datasets​

However, arithmetic addition to aggregate function seems to not work in sql. What should I do to add current_data to the value of avg(current_data)?

Answer

Ty this-

SELECT current_data + 
(
    SELECT avg(current_data) FROM datasets
) AS 'average + current data'
FROM datasets

 
SELECT current_data + (    SELECT avg(current_data) FROM datasets) AS 'average + current data'FROM datasets​