کدی شبیه به این:
SELECT quistion FROM questions WHERE question LIKE '%'+@param+'%'
UNION ALL
SELECT question FROM answers a INNER JOIN questions q ON a.questionid = q.id WHERE answer LIKE '%' + @param + '%'
یا خیلی ساده تر:
SELECT question
FROM questions q
INNER JOIN answers a
ON q.id = a.questionid
WHERE q.question LIKE '%'+@param='@'
OR a.answer LIKE '%'+@param+'%';





