Select only even/odd rows in MySQL [duplicate]

Answer 1

Assuming you have a column that specifies the ordering of the table, then you can use variables to do what you want:

select t.*
from (select t.*, (@rn := @rn + 1) as seqnum
      from table t cross join
           (select @rn := 0) vars
      order by col
     ) t
where mod(seqnum, 2) = 0;

Answer 2

Try to use this:-

SELECT cols
FROM (
      SELECT cols, @rowNumber := @rowNumber+ 1 rn
      FROM YourTable
      JOIN (SELECT @rowNumber:= 0) r
     ) t 
WHERE rn % 2 = 1;