Hi there
How are you?
Would you please explain how the following queries work
//alternate rows
select * from emp where rowid in (select decode(mod(rownum,2),0,rowid, null) from emp);
//3rd max salary
select distinct sal from emp e1 where 3 = (select count(distinct sal) from emp e2 where e1.sal <= e2.sal);
//top n
select * from emp where rownum <= &n;
//bottom n
select * from emp minus select * from emp where rownum <= (select count(*) - &n from emp);
Thank you
