Multiple query, Embedded, Subquery? How to do this?

Question

I'm still trying to learn PL/SQL and haven't gotten to PACKAGES, PROCEDURES, FUNCTIONS etc.
I've posted this in SPATIAL, but I think now it's more of just straight SQL query structure at this point.
It's a query of street locations. I need to take my STREET_NUM, STREET_DIR & STREET_NAME and get the X & Y coords from another table for that exact location. Then I need to do a BETWEEN on the values pulled and +/- 1800 of each X & Y. From that query I need the matching STREET_NUMs & STREET_NAMES from that same table. I then need to use all found street names and street numbers in a query that is used to pull all matching records that have an address that matches all the street names and street numbers.
That is one type of query that I would need. I have another thought on how to do this as well. We are looking for 1 block north & south of each address as well as 1 block east & west. If I were to take an address, say 3200 N. Main, and just do a 3200 +/- N, and then somehow find all the streets east & west of Main that fall within 1 block's distance. I guess this would give valid results, but which would be a simpler query or even doable?
Really need some help on this one. Thanx

Answer 1

Break it down into conditions first
select X_coord, Y_coord
   from My_Coord_tab A, My_Street_Tab B
   where A.street_num = B.street_num
      and A.street_dir = B.street_dir
      and A.street_name = B.street_name
select x_coord, y_coord
    from My_Coord_Tab A, My_Coord_Tab b
    where A.x_coord between (X_Coord from above query - 1800)
                                  and (X_Coord from above quyer + 1800)
        and B.y_coord  between (Y_Coord from above query - 1800)
                                  and (Y_Coord from above quyer + 1800)
Select Street_Num, Street_Name
   from My_Coord_Tab A
   where a.X_Coord = X_Coord (from second query above)
      and a.Y_Coord = Y_Coord  (from second query above)
They you should be able to use them as subqueries
select street_num, street_name
  from my_coord_tab A,
         ( second query
               from ... , (first_query) B
         ) C
   where a.X_Coord = X_Coord (from second query above)
      and a.Y_Coord = Y_Coord  (from second query above)