I need a query that can display only the rows which have the correct 'color' variable in a corresponding table.

If I have these tables:

Code:
Table 1:

id   num  color
1    1    yes
2    2    yes
3    3    yes
4    4    no
5    5    no
6    6    yes
Code:
Table 2:

id   num  answer
1    1    345
2    2    456
3    3    567
4    4    875
5    5    342
6    6    801
I want to display from Table 2 all data in the 'answer' field UNLESS the corresponding 'num' in Table 1 has 'yes' in the 'color' field.

So I want to display only:
875
342

Thanks!