MYSQL空值和空值排序
我有一个名为users的表,其中一些列有空值,它们是MYSQL空值和空值排序,mysql,Mysql,我有一个名为users的表,其中一些列有空值,它们是user\u country,user\u state\u user\u city,user\u area,user\u pincode 我想按计数对空值进行排序 例如: user_id user_country user_state user_city user_area user_pincode 1 1 1 1 1 1 - a
user\u country
,user\u state\u user\u city
,user\u area
,user\u pincode
我想按计数对空值进行排序
例如:
user_id user_country user_state user_city user_area user_pincode
1 1 1 1 1 1 - all values
2 1 1 1 2 - 1 empty or null
3 1 1 - 3 empty or null
4 1 1 1 - 2 empty or null
5 1 - 4 empty or null
它应该是这样的:期望输出
user_id user_country user_state user_city user_area user_pincode
2 1 1 1 1 - 1 empty or null
4 1 1 1 - 2 empty or null
3 1 1 - 3 empty or null
5 1 - 4 empty or null
1 1 1 1 1 1 - all values
我的代码:
$where1 = "user_country IS NOT NULL AND user_state IS NOT NULL AND user_city IS NOT NULL AND user_area_name IS NOT NULL AND user_area_pincode IS NOT NULL AND user_country!='' AND user_state!='' AND user_city!='' AND user_area_name!='' AND user_area_pincode!=''";
$this->db->where($where1);
$order = "user_city IS NOT NULL";
$this->db->order_by($order,'desc');
您可以使用以下查询:
SELECT yourtable.*
FROM yourtable
ORDER BY
CONCAT(user_country,user_state,user_city,user_area,user_pincode) IS NOT NULL,
(user_country IS NULL) +
(user_state IS NULL) +
(user_city IS NULL) +
(user_area IS NULL) +
(user_pincode IS NULL)
请看小提琴