如何从日期列的日期格式不同的源中获取Informatica中日期列的通用格式

Question

Period is a column coming from source which has dates in 3 different formats. I need to convert these to one single format that is 'MON-YY' and dump it into target table.

Source table :

Period 
-------------------
JUN-17
JUN-2017
JUN-06-2017

Target table:

Period 
-------------------
JUN-17
JUN-17
JUN-17

Answer 1

If you're sure you only have strings in those three formats you can just use the substr() function twice to get the start and end sections, and concatenate them back together:

select substr(period, 1, 4) || substr(period, -2)
from source_table

Demo with those values in a CTE:

with source_table(period) as (
            select 'JUN-17' from dual
  union all select 'JUN-2017' from dual
  union all select 'JUN-06-2017' from dual
)
select substr(period, 1, 4) || substr(period, -2)
from source_table;

SUBSTR
------
JUN-17
JUN-17
JUN-17