Codeigniter mysql левое соединение включает выбор ⇐ Php

[Anonymous]

Как преобразовать левое соединение, включая выбор, в метод sql codeigniter? Спасибо. Я просто хочу знать.

SELECT c1.c1_id, c1.c1_name, c2.c2_id, c2.c2_name, c2.c2_type, c2.c2_status, f.f_id, f.f_name, f2.f2_id, f2.f2_name FROM category2 c2
LEFT JOIN category1 c1 ON c1.c1_id = c2.c1_id
LEFT JOIN (
SELECT DISTINCT c2_id, f_id, f_name FROM file ORDER BY f_id DESC
) f ON f.c2_id = c2.c2_id
LEFT JOIN (
SELECT DISTINCT c2_id, f2_id, f2_name FROM file2 ORDER BY f2_id DESC
) f2 ON f2.c2_id = c2.c2_id
WHERE c2.c2_status = 1
GROUP BY c2.c2_id


Подробнее здесь: https://stackoverflow.com/questions/154 ... ude-select