creation of tables with warnings

Hi
Sometimes when I create a table with the
CREATE TABLE sql command,
it creates a table but with some warnings

For example, I create this table in Aqua studio as
create table foo(col1 varchar2);

gives

Warnings: --->
   W (1):
          <---
 0 record(s) affected

The table is created. So what does this warnings mean? where and how do i check them?

Thanks in advance

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