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+--- Thread: help me to change mysql code to php (/showthread.php?tid=68188)
help me to change mysql code to php - kira - 06-07-2017
can anyone help me changing this code to php?
SELECT a1.mark_id, a1.student_id,
COUNT(a2.quiz) Rank
FROM mark a1, mark a2 WHERE a1.quiz < a2.mark_quiz
OR (a1.mark_total=a2.quiz AND a1.student_id = a2.student_id)
GROUP BY a1.student_id, a1.quiz ORDER BY a1.quiz DESC, a1.student_id DESC
thanks.
RE: help me to change mysql code to php - skunkbad - 06-07-2017
There is no reason why you can't run this query as is:
PHP Code:
// In your model
$this->load->database();
$query = $this->db->query('
SELECT a1.mark_id, a1.student_id,
COUNT(a2.quiz) Rank
FROM mark a1, mark a2 WHERE a1.quiz < a2.mark_quiz
OR (a1.mark_total=a2.quiz AND a1.student_id = a2.student_id)
GROUP BY a1.student_id, a1.quiz ORDER BY a1.quiz DESC, a1.student_id DESC
');
if( $query->num_rows() > 0 )
{
// Do something with $result ...
$result = $query->result();
}
RE: help me to change mysql code to php - ivantcholakov - 06-07-2017
a1.mark_id, a1.student_id, COUNT(a2.quiz) AS Rank
You want to show two simple fields and one aggregated field. Probably the newer MySQL servers would refuse to execute such a query.
RE: help me to change mysql code to php - Paradinight - 06-07-2017
(06-07-2017, 05:19 PM)ivantcholakov Wrote: a1.mark_id, a1.student_id, COUNT(a2.quiz) AS Rank
You want to show two simple fields and one aggregated field. Probably the newer MySQL servers would refuse to execute such a query.
the sql is valid. it will work.
RE: help me to change mysql code to php - ivantcholakov - 06-07-2017
I don't see a1.mark_id participating in GROUP BY clause.
RE: help me to change mysql code to php - Paradinight - 06-08-2017
(06-07-2017, 09:31 PM)ivantcholakov Wrote: I don't see a1.mark_id participating in GROUP BY clause.
The sql syntax will work. I would not do that
