The join condition that brings in table
groups needs to be fixed.
SELECT ... FROM group_not JOIN groups ON group_not.group_id = $group_id --> here JOIN notifications ON group_not.not_id = notifications.not_id WHERE group_not.group_id = $group_id
While you actually need:
JOIN groups ON group_not.group_id = groups.group_id
I would also recommend using table aliases to make the query easier to read and write. You should also use a parameterized query rather than concatenating the variable in the query string. So:
SELECT gn.group_not_id, n.not_name, g.group_name FROM group_not gn INNER JOIN groups g ON gn.group_id = g.group_id JOIN notifications ON gn.not_id = n.not_id WHERE gn.group_id = ?
I suggest you to use SELECT DISTINCT AS BELOW:
SELECT DISTINCT group_not.group_not_id, notifications.not_name, groups.group_name FROM group_not JOIN groups ON group_not.group_id = $group_id JOIN notifications ON group_not.not_id = notifications.not_id WHERE group_not.group_id = $group_id";
The SELECT DISTINCT statement is used to return only distinct (different) values.
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