ROUND(345.678,2) ROUND(345.678,-1) ROUND(345.678,-2) : ROUND « Numerical Math Functions « Oracle PL/SQL Tutorial

SQL>
SQL>
SQL> select round(345.678,2)
  2  ,      round(345.678,-1)
  3  ,      round(345.678,-2)
  4  from   dual;

ROUND(345.678,2) ROUND(345.678,-1) ROUND(345.678,-2)
---------------- ----------------- -----------------
          345.68               350               300

SQL>

14.17.ROUND
	14.17.1.	ROUND(x, [y]) gets the result of rounding x an optional y decimal places.
	14.17.2.	ROUND column value
	14.17.3.	ROUND for negative value
	14.17.4.	ROUND may have a second argument to handle precision: means the distance to the right of the decimal point
	14.17.5.	The second argument of ROUND defaults to 0
	14.17.6.	The second argument of ROUND, precision, may be negative, which means displacement to the left of the decimal point
	14.17.7.	ROUND(5.75)
	14.17.8.	ROUND(5.75, 1)
	14.17.9.	ROUND(5.75, -1) (2)
	14.17.10.	ROUND(345.678,2) ROUND(345.678,-1) ROUND(345.678,-2)
	14.17.11.	Demonstrates the ROUND function
	14.17.12.	round(sqrt(sal),2)