--이전 예제의 select문을 이해하셨다면 바로 응용이 가능하셨을텐데요...

SELECT seq, parent_seq, ttext

FROM(

(

SELECT seq AS seqg, seq, parent_seq, ttext

FROM tt

ORDER BY seq ASC

LIMIT 2

)

UNION ALL

(

SELECT parent_seq AS seqg, children.seq, children.parent_seq, children.ttext

FROM (

SELECT seq

FROM tt

ORDER BY seq ASC

LIMIT 2

) AS parent

INNER JOIN tt AS children ON parent.seq = children.parent_seq

)

) AS bb

ORDER BY seqg ASC, seq ASC;