Moodle in English

Hello everyone,

I want to get data of student's answers by $DB->get_records_sql(). My code is

SELECT
    quiza.userid,
    quiza.id AS quizattemptid,
    quiza.attempt,
    quiza.sumgrades,
    qu.preferredbehaviour,
    qa.slot,
    qa.behaviour,
    qa.questionid,
    qa.variant,
    qa.maxmark,
    qa.minfraction,
    qa.flagged,
    qas.sequencenumber,
    qas.state,
    qas.fraction,
    qasd.name,
    qasd.VALUE,
    qa.questionsummary,
    qa.rightanswer,
    qa.responsesummary
from mdl_quiz_attempts quiza 
JOIN mdl_question_usages qu 
ON qu.id = quiza.uniqueid 
JOIN mdl_question_attempts qa 
ON qa.questionusageid = qu.id 
JOIN mdl_question_attempt_steps qas 
ON qas.questionattemptid = qa.id 
LEFT JOIN mdl_question_attempt_step_data qasd 
ON qasd.attemptstepid = qas.id 
WHERE quiza.quiz = '31' and qasd.name = '-finish' and quiza.userid = '25'
 ORDER BY quiza.userid, quiza.attempt, qa.slot, qas.sequencenumber, qasd.name

Thank you very much!

And sorry for my bad English!