如何在MySQL中将列显示为列？

Question

我的桌子名为 Beneficiaryloans ，如下所示

+----+----------------+--------+--------+------+--------+-----------+
| id | beneficiary_id | hfi_id | amount | rate | period | status_id |
+----+----------------+--------+--------+------+--------+-----------+
| 15 |             37 |    116 |    123 |  123 |    123 |         4 |
| 16 |             38 |    117 |    123 |  123 |    123 |         4 |
| 17 |             39 |    116 |    123 |  123 |    123 |         4 |
+----+----------------+--------+--------+------+--------+-----------+

我希望根据 Hfi_id

按如下方式显示

+-----------------+---------------------------+
| beneficiary_id  | hfi_id_116 | hfi_id_117   |
+-----------------+----------------------------
| 37              |  True      |    False     |
| 38              |  False     |    True      |
| 39              |  True      |    False     |
+----------------------------------------------

如何在MySQL中执行此操作？

注意：我在这里发布了一些行，并且 hfi_ids 会在此表中保留标记，如果 3 hfi_id 那么我需要 3列，如果4 hfi_ids 那么我需要 4列，依此类推

Answer 1

试试这个：

SELECT beneficiary_id, 
  CASE hfi_id
      WHEN 116 THEN true
      ELSE false
  END AS hfi_id_116,
  CASE hfi_id
      WHEN 117 THEN true
      ELSE false
  END AS hfi_id_117
FROM your_table

或者如果你需要字符串

SELECT beneficiary_id, 
  CASE hfi_id
      WHEN 116 THEN 'True'
      ELSE 'False'
  END AS hfi_id_116,
  CASE hfi_id
      WHEN 117 THEN 'True'
      ELSE 'False'
  END AS hfi_id_117
FROM your_table