topic Re: How to perform a CROSS JOIN with Talend? in Talend Studio

How to perform a CROSS JOIN with Talend?

Lorenzo5 — Mon, 29 May 2017 16:30:44 GMT

I have two row links from two different tables, and need to combined them in a Cartesian way. Any idea?

Could iterate link (instead of row link) helps me, somehow?

Thank you,

Lorenzo

---

The SQL CROSS JOIN produces a result set which is the number of rows in the first table multiplied by the number of rows in the second table.

This kind of result is called as Cartesian Product.

Re: How to perform a CROSS JOIN with Talend?

TRF — Mon, 29 May 2017 17:56:48 GMT

Never tried before, but what if you use a tMap with these 2 tables, 1 one as main and 1 as lookup, then no join in the tMap and an output flow based on fields from these tables?

Re: How to perform a CROSS JOIN with Talend?

TRF — Mon, 29 May 2017 19:05:35 GMT

It works as expected:

Got 3 lines in main table ("aaaaa", "bbbbb", "ccccc") and 2 lines in the lookup ("AAAAA", "BBBBB").

The result contains 6 lines:

Starting job test at 20:01 29/05/2017.

[statistics] connecting to socket on port 4063
[statistics] connected
.-----+-----.
|tLogRow_35 |
|=----+----=|
|aaa  |bbb  |
|=----+----=|
|aaaaa|AAAAA|
|aaaaa|BBBBB|
|bbbb |AAAAA|
|bbbb |BBBBB|
|ccccc|AAAAA|
|ccccc|BBBBB|
'-----+-----'

[statistics] disconnected
Job test ended at 20:01 29/05/2017. [exit code=0]

Hope this helps.

Re: How to perform a CROSS JOIN with Talend?

TRF — Tue, 30 May 2017 20:30:46 GMT

@lorenzolucioni, does this helps you?

Re: How to perform a CROSS JOIN with Talend?

Lorenzo5 — Tue, 06 Jun 2017 08:39:28 GMT

Yes, thanks.