ROUND may have a second argument to handle precision: means the distance to the right of the decimal point : ROUND « Numerical Math Functions « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. Numerical Math Functions
3. ROUND

SQL>
SQL> -- create demo table
SQL> create table myTable(
  2    id           NUMBER(2),
  3    value        NUMBER(6,2)
  4  )
  5  /

Table created.

SQL>
SQL> -- prepare data
SQL> insert into myTable(ID,  value)values (1,9)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (2,2.11)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (3,3.44)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (4,-4.21)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (5,10)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (6,3)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (7,-5.88)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (8,123.45)
  2  /

1 row created.

SQL> insert into myTable(ID,  value)values (9,98.23)
  2  /

1 row created.

SQL>
SQL> select * from myTable
  2  /

        ID      VALUE
---------- ----------
         1          9
         2       2.11
         3       3.44
         4      -4.21
         5         10
         6          3
         7      -5.88
         8     123.45
         9      98.23

9 rows selected.

SQL>
SQL>
SQL> SELECT id, value, ROUND(value,1)FROM myTable
  2  /

        ID      VALUE ROUND(VALUE,1)
---------- ---------- --------------
         1          9              9
         2       2.11            2.1
         3       3.44            3.4
         4      -4.21           -4.2
         5         10             10
         6          3              3
         7      -5.88           -5.9
         8     123.45          123.5
         9      98.23           98.2

9 rows selected.

SQL>
SQL>
SQL> -- clean the table
SQL> drop table myTable
  2  /

Table dropped.

SQL>