topic Re: Using tMap within the same table in Talend Studio

Using tMap within the same table

perdigao1 — Sat, 16 Nov 2024 00:39:59 GMT

Hi all

I have this table

person_id | person_name | person_ref_id

1 ----------- name1 ---------- 50

2 ----------- name2 ---------- 51

3 ----------- name3 ---------- 52

... ...

50 --------- adress1 --------- 200

51 --------- adress2 --------- 201

52 --------- adress3 --------- 202

... ...

200 ------- country1 -------- 500

201 ------- country2 -------- 501

202 ------- country3 -------- 502

... ...

in which person_ref_id is a pointer to person_id.

For example, if I want to find all the information about person_id = 1, I can search for 50 and then 200 and then 500 as if it was a cycle. I'll obtain then the information name1, adress1 and country1 that refers to the same person.

My question is: how can I get all these information and store in a table like this

person_id | person_name | person_adress | person_country

1 ----------- name1 ------- adress1 -------- country1

2 ----------- name2 ------- adress2 -------- country2

...

How can I do that ? Is it possible to do that by reading the original table only once?

Thank you all

Re: Using tMap within the same table

manodwhb — Mon, 08 Feb 2021 05:22:48 GMT

@Diego Martino , you need to read the file three times with filter condition of person id to extract name, address and country records separately and then do the join on person_ref_id=person_id from address and county records in tMap and then pass the all records into table.

Thanks,

Manohar

Re: Using tMap within the same table

perdigao1 — Mon, 08 Feb 2021 08:07:26 GMT

Hi, thank you for your answer.

Isn't it possible to do that by reading the original file only once?

Re: Using tMap within the same table

manodwhb — Mon, 08 Feb 2021 08:19:54 GMT

@Diego Martino , you can read three times if it is not huge file.

Thanks,

Manohar

Re: Using tMap within the same table

perdigao1 — Mon, 08 Feb 2021 08:22:18 GMT

This is the problem, it's a huge file