如何在Codeigniter ActiveRecord中执行以下查询: -
SELECT *,
(SELECT
image_path
FROM
image
WHERE
image_table = 'model'
AND image_table_id = model_id
GROUP BY image_table_id
LIMIT 1) AS ModelImg
FROM
(SELECT
*
FROM
vw_newcars
where offer_table = 'derivative'
order by offer_order
) x
WHERE make_name = 'Fiat'
group by offer_table_id
limit 12
我遇到问题的部分是如何从Active Record中的子查询中进行选择。
我没有在文档中看到from_select
函数或类似内容。
答案 0 :(得分:3)
我设法通过将from
sub_query放入初始select语句来使查询工作:
$this->db->select("*,
(select image_path from image where image_table = 'model' and image_table_id = model_id
group by image_table_id limit 1) as ModelImg FROM
(SELECT * FROM $view where offer_table = 'derivative' order by offer_order) x");