How to update data in a table having primary key - foreign key link with another table

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How to update data in a table having primary key - foreign key link with another table

pwalter83

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Points: 14575
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July 29, 2013 at 7:27 am

#275736

Hello,
Could someone please tell how can data be updated (refreshed) in one table if the data is refreshed on another table and both tables are linked through a primary key - foreign key ?
I just need to know what logic I need to apply to update the values in a table if the same value has been refreshed in another table.
Thanks.

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Sean Lange SSC Guru Points: 286573 More actions · Answer 1

pwalter83 (7/29/2013)
Hello,
Could someone please tell how can data be updated (refreshed) in one table if the data is refreshed on another table and both tables are linked through a primary key - foreign key ?
I just need to know what logic I need to apply to update the values in a table if the same value has been refreshed in another table.
Thanks.

Without any more details about this I doubt anybody has much to offer. I think that what you are saying is that you have tablea and tableb. There is some column in tableb that is a foreign key to a column in tablea? Can you cascade updates and deletes on the foreign key? Or is your question because the update has already happened and now you want to fix the data in tableb?

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ChrisM@Work SSC Guru Points: 186127 More actions · Answer 2

Sean, there are more details here.

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

Sean Lange SSC Guru Points: 286573 More actions · Answer 3

ChrisM@Work (7/29/2013)
Sean, there are more details here.

I don't know that I would call that details but that certainly shows this is a duplicate thread.

_______________________________________________________________

Need help? Help us help you.

Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.

Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/