Oracle round up function

The ceil and floor functions are sometimes useful for some business data.
ceil(n) takes the smallest integer greater than or equal to the value n; (ceil refers to the roof and ceiling in Chinese, and the function functions to round up )
floor(n) takes the largest integer less than or equal to the value n (floor refers to the floor in Chinese, and the function acts to take down whole) the
following example
SQL> select ceil(9.5) from dual;  CEIL(9.5) ----------         10 SQL> select floor(9.5) from dual; FLOOR(9.5) ------- ---          9