Question

I’m trying to write a query along these lines:

UPDATE Table i2
SET value = 0
WHERE EXISTS (SELECT 1 FROM Table i1 WHERE i2.ID = i1.ID+1)

The problem is that I’m getting “Incorrect syntax near ‘i2’.” I’m guessing this is because it doesn’t like giving a nickname to a table being updated, but if that’s the case, how am I supposed to reference it?

Answer 1

An update does not only have to be on a table directly you can use an alias from a table referenced in the From clause.

UPDATE i2
SET value = 0
FROM Table i2
WHERE EXISTS (SELECT 1 FROM Table i1 WHERE i2.ID = i1.ID+1)