postgres=#
postgres=# -- round(x, s): Returns the value of x, optionally rounded to s decimal places
postgres=# SELECT round(1.4949, 1) AS one_digit_scale,
postgres-# round(1.4949, 3) AS three_digit_scale,
postgres-# round(1.4949, 10) AS ten_digit_scale,
postgres-# round(1.4949, 0) AS rounded;
one_digit_scale | three_digit_scale | ten_digit_scale | rounded
-----------------+-------------------+-----------------+---------
1.5 | 1.495 | 1.4949000000 | 1
(1 row)
postgres=#