Question

I need to perform an SQL query to create a table which lists Quizzes with the same name. This is the query code I have so far:

$sql = "SELECT a.name, a.id FROM tests a 
        INNER JOIN tests b 
        ON a.tests = b.tests WHERE a.id <> b.id";
$result = mysql_query($sql, $conn);

However I’m not getting any results – I’ve made sure to manually check the database and there are definitely duplicates. Any ideas?

Answer 1

I think the simpliest way is to grouped then and filter it using HAVING

SELECT Name, COUNT(*) totalCount
FROM tests
GROUP BY Name
HAVING COUNT(*) > 1