小编use*_*073的帖子

任何人都可以将此查询转换为活动记录codeigniter ???

 SELECT  b.name,
    SUM(CASE WHEN c.size = 'S' THEN 1 ELSE 0 END) S,
    SUM(CASE WHEN c.size = 'M' THEN 1 ELSE 0 END) M,
    SUM(CASE WHEN c.size = 'L' THEN 1 ELSE 0 END) L,
    SUM(CASE WHEN c.size = 'XL' THEN 1 ELSE 0 END) XL
   FROM    orderTB a
    INNER JOIN productTB b
        ON a.id_product = b.id_shirt
    INNER JOIN sizeTB c
        ON a.id_size = c.id_size
GROUP BY b.name

我试过这样的

  function get()
 {
  $this->db->select("b.name,SUM(CASE WHEN c.size ='S' THEN 1 …