So basically what I want is:
select (table2.col1 * sum(table1.col1)) as myAggregate
from table1
join table2 ON table2.id = table1.id
I've gotten this far but don't know how to add the multiplication:
Table1Model.findAll({
attributes: [[Sequelize.fn('SUM', 'col1'), 'myAggregate']]
include: [Table2Model]
})