1 Reply Latest reply on Nov 13, 2017 5:42 AM by Zhouyi Zhang

Does tableau extract work if I change joins between tables

Manjiri Mudgal Nov 12, 2017 11:41 PM

Hi,

I have a requirement in Tableau, wherein I need to save historic data in form of snapshot. So when in future the data changes I have snapshot of my historic data. My concern is if I change the joins between tables that are used in this extract, will the extract work? Or do I need to update the extract again.

example: If I have two tables A and B, when I create the extract the joins I specify is A.id=B.id. But later I wish to change it to A.rowid=B.rowid. I need to maintain the historic data and not update the extract with new records.

Appreciate your help!

1. Re: Does tableau extract work if I change joins between tables

Zhouyi Zhang Nov 13, 2017 5:42 AM (in response to Manjiri Mudgal)

Hi, Manjiri

I don't think you can do this.

But if your you populate the same columns from the query, you probably can use union for two different periods.

e.g,
select * from A a
left join B b
on a.id = b.id
where date between xxxx and xxxx

union

select * from A a
left join B b
on a.Rowid = b.Rowid
where date between yyy and yyyy

Hope this could help

ZZ
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