Do an UPDATE using a LEFT OUTER JOIN

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Do an UPDATE using a LEFT OUTER JOIN

itortu

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Points: 1914
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January 23, 2008 at 2:31 pm

#178422

Hello,
I need help writing a basic query. I do not have much experience using any types of JOINS inside an UPDATE query, so I appreciate any help offered.
If the values for B table fields are null, i.e. already removed, then the status on A table should be set to "Contacted"
The joining filed on this two tables will be customer_id
In advance, thank you very much. 🙂

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Jason Selburg SSC-Insane Points: 24641 More actions · Answer 1

Please read ... http://www.sqlservercentral.com/articles/Best+Practices/61537/ ... and repost your question. 😀

This also seems like a homework question. What have you tried already?

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sara karasik SSCommitted Points: 1573 More actions · Answer 2

update a

set fieldone = 'contacted'

from tableONE a

left join tableTWO b on a.customerID = b.customer_id

where b.customer_id is null

Jeff Moden SSC Guru Points: 1004329 More actions · Answer 3

From the description, the code looks correct... did you try it?

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

itortu SSCommitted Points: 1914 More actions · Answer 4

Yes I did try it and it seems to work fine. I just have not finished the app. coding. to a point where I can test it from there.

Anyhow, I appreciate your help. It saved me a lot of time.

What other steps do I need to take to process this question correctly?

Thank you.