Making JOINS

Hi alll
I have these tables below with 3 fields each. I want to get the record
in table 1 whose field number value is same in table 2 but field number
2 on both tables are different. I mean i want the record
1500 800 2. Insight: Table 1 is modules ordered and table 2 is modules
delivered. I want to get 1500 800 2.beacuse module 800 was ordered but
in table 2 module 503 was delivered. can some one help me with a join

nice weekeend

Table 1

10 5012 10
1600502
100 502 3
1500800 2




Table 2

1500503 1
14004000
100502 10
100600
100502 3