Unpivot query help

Question

Hi ALL
I have the following sample data:
AMENDMENT_DATES_ID     AMENDMENT_ID     ENTRY_DATE     AMENDMENT_DATE_CODE
29710     1     12/20/2007     15
31852     2     1/17/2006     29
31860     3     2/9/2006     29
31868     4     9/13/2007     29
31876     6     3/28/2006     29
29994     88     11/21/2007     6
31890     9     8/23/2006     29
I tried to create seperate fields based on the "AMENDMENT_DATE_CODE" using CASE AND DECODE but was not successful. I need the values of the field "AMENDMENT_DATE_CODE" as seperate fields, like :
AMENDMENT_DATES_ID AMENDMENT_ID ENTRY_DATE 15 29 6
Please need help.
Thanks

Answer 1

Hi,
Unpivot means display multiple columns from one row as if they were one column on multiple rows.
It looks like you want to do the opposite: display the same column from 3 rows as 3 columns on 1 row. That's called Pivot .
This thread shows what you need:
Help for a query to add columns
That example used the aggregate COUNT; you'll probably want MIN or MAX instead. If the combination (AMENDMENT_DATES_ID, AMENDMENT_ID, ENTRY_DATE, AMENDMENT_DATE_CODE) is unique, it won't matter whethere you use MIN or MAX; when there's no more than 1 item, the largest one is the same as the smallest.
As you can see from that thread, there is a different (better) way of doing pivots starting in Oracle 11. What version are you using?
If you'd like help, post a little sample data (CREATE TABLE and INSERT statements), the results you want from that data, and your best attempt at a query.