Unhelpful Oracle error message: expected %s, got %s using to_date

Here is a simple query:

SELECT COUNT(*) FROM m_bug_t 
WHERE date_submitted BETWEEN T开发者_高级运维O_DATE('2011-08-22','yyyy-mm-dd') AND TO_DATE('2011-08-29','yyyy-mm-dd') 
AND status != 100

that gives the following error message

ORA-00932: inconsistent datatypes: expected NUMBER got DATE
00932. 00000 -  "inconsistent datatypes: expected %s got %s"
*Cause:    
*Action:
Error at Line: 2 Column: 22

Any ideas? I'm using to using MySQL where this works even without the to_date function.

It looks like the date_submitted column is numeric, and you're trying to compare it to a date. Oracle won't let you do this.

[EDIT:] Assuming that the Epoch is Jan 1, 1970, you should be able to use:

TO_DATE('01/01/1970 00:00:00', 'MM-DD-YYYY HH24:MI:SS') + (date_submitted / (24 * 60 * 60))

To get the actual date that is represented. I'm not sure if this will be 100% accurate, since your date in seconds may not include leap seconds and Oracle's likely does.

Converting Oracle dates to unix timestamp values requires the following function:

SELECT (sysdate - to_date('01-JAN-1970','DD-MON-YYYY')) * (86400) as dt FROM dual; 

or in the case of your sql where clause:

WHERE date_submitted between 
    ((TO_DATE('2011-08-22', 'yyyy-mm-dd') - to_date('01-JAN-1970','DD-MON-YYYY')) * (86400))
AND 
    ((TO_DATE('2011-08-29', 'yyyy-mm-dd') - to_date('01-JAN-1970','DD-MON-YYYY')) * (86400))