获取具有不同类型的 id 值的员工列表作为输出中的列名

Posted 2023-05-09

【中文标题】获取具有不同类型的 id 值的员工列表作为输出中的列名

【英文标题】：To get list of employees with an id value different type as column name in output

【发布时间】：2020-11-24 12:52:30

【问题描述】：

我有一张表empl，其值如下：

empid   id_val      id_type
----------------------------
123456  ABCD1234XY  SSN
123456  U9876512    PASSPORT
123456  9090876543  UID
123456  V2345677    VOTERID
123457  ABCD1235YZ  SSN
123457  V8765120    PASSPORT
123457  8090876541  UID
123457  A2342627    VOTERID
123458  ABCD1236ZZ  SSN
123458  X9876510    PASSPORT
123458  9090876599  UID
123459  ABCD1238YY  SSN
123459  8080876549  UID
123459  Z2345678    VOTERID

我想要像 ID 类型列表这样的输出作为列的意思：

empid   SSN         PASSPORT   UID         VOTERID
--------------------------------------------------
123456  ABCD1234XY  U9876512   9090876543  V2345677
123457  ABCD1235YZ  V8765120   8090876541  A2342627
123458  ABCD1236ZZ  X9876510   9090876599  NULL
123459  ABCD1238YY  NULL       8080876549  Z2345678

能否请您帮我获得类似上述格式的输出，其中价值提及为顶部。

【参考方案1】：

您可以使用条件聚合：

select empid,
       max(case when id_val = 'SSN' then id_type end) as SSN,
       max(case when id_val = 'PASSPORT' then id_type end) as PASSPORT,
       max(case when id_val = 'UID' then id_type end) as UID,
       max(case when id_val = 'VOTERID' then id_type end) as VOTERID
from t
group by empid;

【参考方案2】：

你可以使用PIVOT:

SELECT *
FROM   table_name
PIVOT (
  MAX( id_val )
  FOR id_type IN (
    'SSN' AS ssn,
    'PASSPORT' AS passport,
    'UID' AS "UID",
    'VOTERID' AS voterid
  )
)
ORDER BY empid;

其中，对于样本数据：

CREATE TABLE table_name ( empid, id_val, id_type ) AS
SELECT 123456,  'ABCD1234XY',  'SSN' FROM DUAL UNION ALL
SELECT 123456,  'U9876512',    'PASSPORT' FROM DUAL UNION ALL
SELECT 123456,  '9090876543',  'UID' FROM DUAL UNION ALL
SELECT 123456,  'V2345677',    'VOTERID' FROM DUAL UNION ALL
SELECT 123457,  'ABCD1235YZ',  'SSN' FROM DUAL UNION ALL
SELECT 123457,  'V8765120',    'PASSPORT' FROM DUAL UNION ALL
SELECT 123457,  '8090876541',  'UID' FROM DUAL UNION ALL
SELECT 123457,  'A2342627',    'VOTERID' FROM DUAL UNION ALL
SELECT 123458,  'ABCD1236ZZ',  'SSN' FROM DUAL UNION ALL
SELECT 123458,  'X9876510',    'PASSPORT' FROM DUAL UNION ALL
SELECT 123458,  '9090876599',  'UID' FROM DUAL UNION ALL
SELECT 123459,  'ABCD1238YY',  'SSN' FROM DUAL UNION ALL
SELECT 123459,  '8080876549',  'UID' FROM DUAL UNION ALL
SELECT 123459,  'Z2345678',    'VOTERID' FROM DUAL;

输出：

EMPID |社保号 |护照 |用户名 |投票人 -----: | :--------- | :------- | :--------- | :-------- 123456 | ABCD1234XY | U9876512 | 9090876543 | V2345677 123457 | ABCD1235YZ | V8765120 | 8090876541 | A2342627 123458 | ABCD1236ZZ | X9876510 | 9090876599 | 空 123459 | ABCD1238YY | 空 | 8080876549 | Z2345678

db小提琴here