Question

我有这个查询可能会返回多个结果。是否可以对其进行排序并按以下顺序显示：待处理，失败，应用，提交，取消？

即按上述pa.status排序。

SELECT
  cl.id,cl.lead_id,cl.client_name,po.id,po.carrier,
  pa.downpayment_time,pa.status,pa.policy_id
FROM
  pdp_client_info AS cl,
  pdp_policy_info AS po,
  pdp_payment AS pa
WHERE
  cl.id = po.id AND po.id=pa.policy_id
 AND pa.downpayment_date = '$current_date'
 AND (pa.status='pending'
   OR pa.status='failed'
   OR pa.status='application'
   OR pa.status='submitted'
   OR pa.status='canceled')

Answer 1

使用FIND_IN_SET功能：

http://dev.mysql.com/doc/refman/5.1/en/string-functions.html#function_find-in-set

代码将如下所示：

ORDER BY FIND_IN_SET(pa.status, 'pending,failed,application,submitted,canceled')

以下是我将如何重写SQL查询：

SELECT
  cl.id, cl.lead_id, cl.client_name, 
  po.id, po.carrier,
  pa.downpayment_time, pa.status, pa.policy_id
FROM
  pdp_client_info AS cl
  JOIN pdp_policy_info AS po ON (cl.id = po.id)
  JOIN pdp_payment AS pa ON (po.id = pa.policy_id)
WHERE
  (pa.downpayment_date = '$current_date')
  AND (pa.status IN ('pending', 'failed', 'application', 'submitted', 'canceled'))
ORDER BY
  FIND_IN_SET(pa.status, 'pending,failed,application,submitted,canceled')

Answer 2

...
ORDER BY CASE WHEN pa.status = 'pending' THEN 1
              WHEN pa.status = 'failed' THEN 2
              WHEN pa.status = 'application' THEN 3
              WHEN pa.status = 'submitted' THEN 4
              WHEN pa.status = 'canceled' THEN 5
              ELSE 6
         END

Answer 3

我建议您将列类型更改为Enum 。这对未来有好处。

ALTER TABLE pdp_client_info  ADD t_status ENUM ('PENDING','FAILED','APPLICATION','SUBMITTED','CANCELED'); 
-- t_status is temporary status
UPDATE pdp_client_info SET `t_status` = UPPER(`status`);
ALTER TABLE pdp_client_info  MODIFY `status` ENUM ('PENDING','FAILED','APPLICATION','SUBMITTED','CANCELED');
UPDATE pdp_client_info SET `status` = `t_status`;

现在只需添加ORDER BY pa.status即可。它会一直有效。

按特定值排序

3 个答案: