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Editorial Team
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Asked: 2026-06-13T11:54:07+00:00

I have two tables in my database. TableOne has theKey primary key. TableTwo has

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I have two tables in my database. TableOne has theKey primary key. TableTwo has a foreign key theKey that refers to the corresponding column in the TableOne. Now I am trying to update theKey in TableTwo:

  UPDATE TableTwo
  SET theKey = NewIk
  FROM TableTwo W
  JOIN TableThree D ON W.theKey_backup = D.OldIk
  WHERE dt >= '2012-05-01'

But I receive the following error:

The UPDATE statement conflicted with the FOREIGN KEY constraint
“FK_TableTwo_TableOne”. The conflict occurred in database “MyDB”,
table “dbo.TableOne”, column ‘theKey’.

Could you please explain why I get this error if I don’t touch the TableOne?

Thanks.

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1 Answer

  1. Editorial Team

    You’re trying to set TableTwo.theKey to a value that doesn’t exist in the referenced table, TableOne – that’s what the error is saying.

    So you need to check why this is happening – where are you selecting that new value from? Why is it a value that doesn’t (yet) exist in TableOne?

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