Imagine this script (10gR2) :

```
set echo on
select BINARY_DOUBLE_INFINITY -
BINARY_DOUBLE_INFINITY from DUAL;
```

Run it and you would will get an expected result!

```
SQL> select BINARY_DOUBLE_INFINITY -
> BINARY_DOUBLE_INFINITY from DUAL;
BINARY_DOUBLE_INFINITY
----------------------
Inf
```

The issue in sqlplus is that – at the end of line means “query continues next line”. The correct answer of Inf-Inf is Nan.

```
SQL> select BINARY_DOUBLE_INFINITY
-BINARY_DOUBLE_INFINITY from DUAL;
BINARY_DOUBLE_INFINITY-BINARY_DOUBLE_INFINITY
---------------------------------------------
Nan
```

Thanks to recall us that point, but the problem is not limited with BINARY_DOUBLE_INFINITY usage :

SQL> select 1 -

> 1 from dual;

select 1 1 from dual

*

ERROR at line 1:

ORA-00923: FROM keyword not found where expected

…where 0 would be expected.

All the best !

ok course, you could also have

SELECT SAL-

COMM FROM EMP;