How to reference a temporary table in a subquery?

Question

I have a local table variable in a stored procedure, containing a couple of columns; I need to update column 2 of each row with the result of a subquery based on the value of column 1 for that row.

Something like:

UPDATE @mytable
SET column2 = (SELECT ... FROM ... WHERE something = @mytable.column1)

But this doesn't seem to work, I get an error about @mytable being undefined.

What is the correct syntax for this query?

Answer 1

Have you tried using an ALIAS?

UPDATE temp 
SET temp.column2 = (SELECT ... FROM ... WHERE something = temp.column1) 
FROM @mytable temp