Using a table variable inside of a exists statement

Question

I am trying to update a column inside of a table variable based on a condition, the condition being that the ID of the table variable does not exist in a different table:

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Answer 1

Here's a version of the previous two using aliases to get around your issue:

UPDATE @BugRep
SET IsValid = 'N'
FROM @BugRep BR
    LEFT JOIN BUG B
        ON BR.BUGCode = B.CODE
WHERE B.CODE is null

This also avoids the inefficiencies related to "is not null" and "not exists".