May-20-2019, 04:32 PM
You are combining two tables here: FROM ElectionResults2012, Places
but you only give the length of one table. What is the length of each table? The join then multiples those lengths together, and that could be millions of records of course.
but you only give the length of one table. What is the length of each table? The join then multiples those lengths together, and that could be millions of records of course.