exec ('
UPDATE DI
SET DI.Field1 = src.Field1
   ,DI.Field2 = src.Field2
   ,etc
FROM tablename DI
   INNER JOIN Server.Dbase_ ' + @client + '.dbo.tablename src
   ON DI.key = src.key
   WHERE  DI.dbcode = ''' + @client + '''
   and    src.lastedit_date > DI.lastedit_date

insert into tablename
(dbcode, Field1, Field2, etc)
select
   ''' + @client + '''
   ,Field1
   ,Field2
   ,etc
FROM Server.Dbase_ ' + @client + '.dbo.tablename
WHERE key NOT IN (SELECT key FROM tablename where dbcode = ''' + @client + ''')
')