How to pivot data using Informatica when you have variable amount of pivot rows?

Question

Based on my earlier questions, how can I pivot data using Informatica PowerCenter Designer when I have variable amount of Addresses in my data. I would like to Pivot e.g four addresses from my data. This is the structure of the source data file:

+---------+--------------+-----------------+
| ADDR_ID |     NAME     |     ADDRESS     |
+---------+--------------+-----------------+
|       1 | John Smith   | JohnsAddress1   |
|       1 | John Smith   | JohnsAddress2   |
|       1 | John Smith   | JohnsAddress3   |
|       2 | Adrian Smith | AdriansAddress1 |
|       2 | Adrian Smith | AdriansAddress2 |
|       3 | Ivar Smith   | IvarAddress1    |
+---------+--------------+-----------------+

And this should be the resulting table:

+---------+--------------+-----------------+-----------------+---------------+----------+
| ADDR_ID |     NAME     |    ADDRESS1     |    ADDRESS2     |   ADDRESS3    | ADDRESS4 |
+---------+--------------+-----------------+-----------------+---------------+----------+
|       1 | John Smith   | JohnsAddress1   | JohnsAddress2   | JohnsAddress3 | NULL     |
|       2 | Adrian Smith | AdriansAddress1 | AdriansAddress2 | NULL          | NULL     |
|       3 | Ivar Smith   | IvarAddress1    | NULL            | NULL          | NULL     |
+---------+--------------+-----------------+-----------------+---------------+----------+

I guess I can use

SOURCE --> SOURCE_QUALIFIER --> SORTER --> AGGREGATOR --> EXPRESSION --> TARGET TABLE

But what kind of port should I use in AGGREGATOR and EXPRESSION transforms?

Answer 1

You should use something along the lines of this:

Source->Expression->Aggregator->Target

In the expression, add a variable port:

v_count expr: IIF(ISNULL(v_COUNT) OR v_COUNT=3, 1, v_COUNT + 1)

OR

v_count expr:  IIF(ADDR_ID=v_PREVIOUS_ADDR_ID, v_COUNT + 1, 1)

And 3 output ports:

o_addr1 expr: DECODE(TRUE, v_COUNT=1, ADDR_IN, NULL)
o_addr2 expr: DECODE(TRUE, v_COUNT=2, ADDR_IN, NULL)
o_addr3 expr: DECODE(TRUE, v_COUNT=3, ADDR_IN, NULL)

Then use the aggregator, group by ID and select always the Max, e.g.

agg_addr1: expr: MAX(O_ADDR1)
agg_addr2: expr: MAX(O_ADDR2)
agg_addr3: expr: MAX(O_ADDR3)

If you need more denormalized ports, add additional ports and set the initial state of the v_count variable accordingly.