仅当某个状态为真时如何对列进行分组

Question

$this->db->select('C.product_id,
                   A.customer_name,
                   A.contact_number,
                   A.email_id,
                   A.country_area_id,
                   A.sub_area_id,
                   A.building_no,
                   A.landmark,
                   A.alternative_number,
                   A.timing,
                   A.order_comments,
                   A.latitude,
                   A.longitude,
                   A.shipping_charge,
                   B.stock_item_stock,
                   C.bundle_status,
                   C.bundle_product_id');
        
$this->db->from('tbl_inventory_items as C');
        
$this->db->join('tbl_stock as B','B.stock_item_id=C.product_id and B.stock_status=0','left');
        
$this->db->join('tbl_inventory as A','C.inventory_id=A.inventory_id','left');
        
$this->db->where('C.inventory_id',$inv_ID);

这里如果 C.bundle_status=3 我想对 C.bundle_product_id 分组，如果没有，不需要分组

Answer 1

使用这个

$this->db->group_start()->where('C.bundle_status',3)->group_by('C.bundle_product_id )->group_end()

或创建 else 条件

->or_group_start()->where_not_in('C.bundle_status',3)->group_end()