Select from table on highest priority

I have a table, TAB1, which has, amongst others, 2 fields. FIELD1 is a non-unique ID and FIELD2 is a two character code. For example:
123,AA
123,AZ
124,BB
124,BY
I also have a second table TAB2 which contains 3 fields. FIELD1 + FIELD2 are two character codes and FIELD3 is a integer used as a priority. TAB2 is used as a translation table. For Example:
AA,OO,1
AZ,O2,2
BB,OQ,3
BY,P9,4
What I would like to do is for each ID in TAB1, select the translation code from TAB2 with the highest priority.
Any help appreciated.
Thanks

user12141187 wrote:
What I would like to do is for each ID in TAB1, select the translation code from TAB2 with the highest priority.Assuming 1 is highest priority and 4 is lowest :
select field1, field2 From
( Select
    t1.field1,t2.field2 ,rank() over(partition by t1.field1 order by t2.priority) rn
    from
    Tab1 T1,Tab2 T2
    where
    t1.field2 = t2.field1
where rn = 1Vivek L

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