VS 2010 [RESOLVED] Million Records. Quick Update?

Hi All.

I have two tables in a access db

Table 1 - Contains Approx 1.2 million records
Table 2 - Contains Approx 900 records of Part Numbers

One column in Table 1 contains a list of Part Numbers

What i need to do is run through the 1.2 million records in Table 1 and if the part number in Table 1 exisits in Table 2 add a "Yes" to a column in Table 1 called "Exisits"

Is there a way i can do this quick?

Thanks in advance
Alex