sql - how can we assign a ORDER BY in two seperate fields in MySql query? -


how set order 2 separate fields in mysql

code

$sql = 'select q.question_id, a.answer_id, q.question_name, a.option_name, q.display_order ques_order, a.correct, a.display_order opt_order questions q join answers on (a.question_id = q.question_id) test_id = '.$m_test_id.' order ques_order, opt_order asc';

error message:

mysql­error: have error in sql syntax; check manual corresponds my­sql server version right syntax use near '­order ques_­order,­ opt_­order asc' @ line 4

order ques_­order,­ opt_­order asc;

there's wrong $m_test_id; it's empty , causing issues sql grammar. consider using prepared statements:

$sql = 'select q.question_id, a.answer_id, q.question_name, a.option_name, q.display_order      ques_order, a.correct, a.display_order opt_order      questions q      join answers on a.question_id = q.question_id      test_id = :test     order ques_order, opt_order asc';   $stmt = $db->prepare($sql); $stmt->execute(array(':test' => $m_test_id));

besides that, should find out why $m_test_id empty in first place.

if you're not using pdo or mysqli can use mysql_real_escape_string() note it's deprecated , shouldn't used anymore.


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