致命的な問題は、私はこれらの3つのクエリに関する問題を抱えている

Question

を問い合わせますこのエラー：

You have an error in your SQL syntax; check the manual that corresponds to your 
MySQL server version for the right syntax to use near ') and 
test_history.user_id = 82' at line 3 

You have an error in your SQL syntax; check the manual that corresponds to your 
MySQL server version for the right syntax to use near ') and 
test_history.user_id = 82 and is_correct = 1' at line 2 

You have an error in your SQL syntax; check the manual that corresponds to your 
MySQL server version for the right syntax to use near ')' at line 1 

You have an error in your SQL syntax; check the manual that corresponds to your 
MySQL server version for the right syntax to use near ') and percentage > 0' at 
line 3 

Answer 1

$_SESSION['ids_tests']以降、配列であると思われます。implode(',',$_SESSION['ids_test'])と書く必要があります。 PHPの場合：

$query = "select * from test_topics inner join 
     test_topics_link on test_topics.`topic_id` = test_topics_link.`topic_id` 
     where test_topics_link.test_id in (". 
     implode(',',$_SESSION['ids_tests']).") and percentage > 0";