Why is it not possible to navigate on the command line?

Question

PostgreSQL

Why is it not possible to move the dotted line with the keyboard arrows, values ​​appear on the command line instead.

^[[C^[[D^[[B^[[A^[[

Answer 1

echo $TERM what outputs?

Answer 2

If you answer the question from the title, then because readline was excluded from the assembly. I quote:

The GNU readline library is designed to create a uniform
user interface in programs that use
command line input.

Answer 3

try pressing the arrows while holding Ctrl