Joining 2 tables without duplicating the same entries associated

[Wangertron]

I have 2 tables (see below): 

Whats the best way of joining them so I can have consolidated Customer ID list (1.0 + 2.0) but the records are not duplicated. so:

1. if I do a total of points earned (so one address will only get counted once despite there are 2 separate customer ids)
2. The Customer ID list will still list individually and show me the address and points earned accordingly. (i.e, I don’t want it to display as 2,5 | 234 street | 15 points earned . I would like to see 2 | 234 street | 15 points earned , 5 | 234 street | 15 points earned)

Table 1

Customer_ID_1.0	Address	points earned
1	123 street	20
2	234 street	15
3	345 street	30
4	456 street	40

Table 2

Customer_ ID_2.0	Address	points earned
5	234 street	15
6	123 street	20

Hope it make sense!