Explanation for the following SQL query

I came across this SQL query and am not able to understand how is it working.

SELECT answer AS answer
FROM
  (SELECT answer
   FROM "default"."enriched-responses-dev") AS virtual_table
LIMIT 1000;

And how is it different from this?

SELECT answer AS answer
FROM "default"."enriched-responses-dev"
LIMIT 1000;

>Solution :

I think the second SQL statement is more efficient because there is no need for a temporary result. As far as the output is concerned, both will return the same result.

There is no need for a sub-query in this instance.

It can be simplified to:

SELECT answer
FROM "default"."enriched-responses-dev"
LIMIT 1000;