oracle - 在基于日期的选择语句中获取oracle中的自定义线性唯一ID

Question

我有一个这样的 oracle 表。

我想在选择语句中获取格式为 Mon-YY/唯一编号的自定义唯一 ID

结果看起来像（参见 UNIQUEORDERID 列）

是否可以在 select 语句中实现结果？请帮我写查询。

谢谢，萨贾德

Answer 1

试试这个 -

SELECT REQUEST_ID,
       NAME_OF_TRAINING,
       APPLIED_DATE,
       to_char(APPLIED_DATE,'MON-YY') || '/' || ROW_NUMBER over (partition by to_char(APPLIED_DATE,'MON-YY') order by to_char(APPLIED_DATE,'MON-YY')) AS UNIQUEORDERID
FROM tablename;

Answer 2

SELECT request_id,
       name_of_training,
       applied_date,
       to_char(applied_date,'MON-YY') || 
               '/' || 
               to_char(row_number() over (partition by to_char(applied_date,'MON-YY'), '000')
               ) AS UNIQUEORDERID
FROM tablename;

Answer 3

select a.*,to_char(a.applied_date,'MON-YY')||a.request_id UNIQUEORDERID
from table_name a; 

编辑 将此转换为您的数据

select object_name
,to_char(created,'MON-YY')||'/'||row_number() over (partition by to_char(created,'MON-YY') order by to_char(created,'MON-YY'))
from user_objects;