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drop table test_table;
create table test_table (string varchar(10), num integer);
...
insert into test_table(string,num) values('h',8);
insert into test_table(string,num) values('i',9);
insert into test_table(string,num) values('j',10);

SELECT string, num
FROM test_table limit 4,3

select t1.string, t1.num from
(select string, num, rownum rn from test_table) t1 
where t1.rn between 5 and 7;