sql - Is the 'as' keyword required in Oracle to define an alias?

Question

Is the 'AS' keyword required in Oracle to define an alias name for a column in a SELECT statement?

I noticed that

SELECT column_name AS "alias"

is the same as

SELECT column_name "alias"

I am wondering what the consequences are of defining a column alias in the latter way.

Answer 1

According to the select_list Oracle select documentation the AS is optional.

As a personal note I think it is easier to read with the AS