You might try this, using CodeIgniter’s Active Record class:
$this->db->join("table2", "table1.thing_id = table2.id") ->where("table2.otherthing_id", $id) ->delete("table1");
This doesn’t work, as CodeIgniter ignores joins when doing Active Record deletes.
Instead, you’ll have to write out the SQL ‘manually’ – something like this:
$sql = "DELETE t1 FROM table1 t1 JOIN table2 t2 ON t1.thing_id = t2.id WHERE t2.otherthing_id = ?";
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