Determining best method to traverse a table and update another table

Question

I am using Delphi 7, BDE, and Interbase (testing), Oracle (Production).

I have two tables (Master, Responses)

I need to step through the Responses table, use its Master_Id field to look it up in Master table (id) for matching record and update a date field in the Master table with a date field in the Responses table

Can this be done in SQL, or do i actually have to create two TTables or TQueries and step through each record?

Example:

Open two tables (Table1, Table2)

with Table1 do
begin
 first;
 while not EOF do
 begin
  //get master_id field
  //locate in id field in table 2
  //edit record in table 2
  next;
 end;
end;  

thanks