Getting alternate rows from a table

How can I get alternane rows (records) from a table? Or, how can I get the 1st, 3rd, 5th... 91st, 97th rows or records from a table?

Suppose T is your table. The way to get your alternate rows is to use the in-line view technique like this:

select a.* from
(select rownum as row_num,T.*
  from T) a
where mod (a.row_num,2) = 1;

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