Limit on result

I have seen this question around the net several times, but
no proper solution have been provided.
What I am doing is that I am basically returning the last 5
results in the db. The db. has a potential for a size about
1000 rows.
Even though by the use of caching etc. I refuse to generate
a query that returns all the rows, and then selecting 5.
both MySql and Postgresql has the 'LIMIT' clause, which is
basically what I want.
I tried hacking around using ROWID, but this did not generate
proper results, because the ROWID is generated befor my order
by clause.
PLEASE HELP

You can limit your result by an SQL trick!
Here is an example.
SELECT * FROM (SELECT COL1,COL2,ROWNUM ROWNUMBER FROM SOMETABLE
WHERE SOMECONDITION) WHERE ROWNUMBER BETWEEN 500 AND 600
PS:the inner SELECT statement is your original query!

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