Update statement involving two different catalogs

Trying to execute an update of a single field where the current db wants to pull values from last night's backup. Should be something close to:

update myTable 
   set status = (select status 
               开发者_开发百科    from .lastBackup.dbo.myTable as t 
                  where t.idField = idField)

Help?

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Try this:

update t
    set status = b.status
    from myTable t
        inner join lastBackup.dbo.myTable b
            on t.idField = b.idField