Greater than is giving me equal to's

Question

So I'm writing a procedure in PL/SQL that has the logic below:
SELECT
FROM
WHERE
    CASE
        WHEN travel_time IS NULL THEN NULL
        WHEN travel_time = 0       THEN NULL
        ELSE miles/(travel_time/60)
    END >
    CASE
        WHEN (SUBSTR(id, 2, 3) BETWEEN '099' AND '200')
            THEN 60
        ELSE 45
    END;In the result set, I'm getting records where the result of the first and second case statement are both 60.
So basically, if the result of the first case statement is GREATER THAN the result of the second case statement, the record is supposed to show up, but I'm getting records that are GREATER THAN OR EQUAL TO. I'm sure I could just change the second case statement to give 61 rather than 60, and I'm sure it would work. But shouldn't this logic work without having to do that?
Thanks!
Edited by: jjmiller on Mar 26, 2010 7:24 AM

Answer 1

As Frank said, a small test case (with CREATE TABLE and INSERTs) would help.
Works for me.
SQL> select * from v$version ;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE     10.2.0.4.0     Production
TNS for Solaris: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
SQL> create table travel(id varchar2(3), miles number, travel_time number) ;
Table created.
SQL> insert into travel values (1, 10, 10) ;
1 row created.
SQL> insert into travel values (2, 60, 10) ;
1 row created.
SQL> insert into travel values (3, 46, 10) ;
1 row created.
SQL> insert into travel values (4, 60, null) ;
1 row created.
SQL> commit ;
Commit complete.
SQL> select * from travel ;
ID       MILES TRAVEL_TIME
1         10            10
2         60            10
3         46            10
4         60
SQL> select id, miles, travel_time, case when travel_time is null then null when travel_time = 0 then null else miles/(travel_time/60) end cmp1, case when id between '1' and '4' then 60 else 45 end cmp2 from travel ;
ID       MILES TRAVEL_TIME       CMP1       CMP2
1           10          10         60         60
2           60          10        360         60
3           46          10        276         60
4          600                                60
SQL> select * from travel where case when travel_time is null then null when travel_time = 0 then null else miles/(travel_time/60) end > case when id between '1' and '4' then 60 else 45 end ;
ID       MILES TRAVEL_TIME
2           60          10
3           46          10