How to JOIN three tables in BigQuery by a common column name

Question

I have three tables with the following relation.

t1 has program_id

t2 has program_id and product_name

t3 has product_name and price

t1

order_id|product_id|   program_id
  1     |        AA|          100
  2     |        BB|          110
  3     |        CC|          500
  4     |        DD|          550

t2

name    |program_id|    name
 mike   |       100|    1bx
 john   |       110|    2bx
 bob    |       500|    3bx
 clara  |       550|    3bx
 jane   |       112|    55x

t3

admin_id|product_name|revenue
  z1    |         1bx|    100
  z2    |         2bx|    110
  z3    |         3bx|    500
  z4    |         4bx|    550

My purpose here is to JOIN the first two tables and after that JOIN the result of the first JOIN with the third table. In the end it should look something like:

t4

program_id|product_name|revenue
  z1      |         1bx|    100
  z2      |         2bx|    110
  z3      |         3bx|    500
  z4      |         4bx|    550

where t3 would give me the price for each program_id and product_name. How could I efficiently join the third table with the result of the first Join?

Answer 1

This just sounds like two JOIN s to me:

select program_id, product_name, revenue as price
from table1 t1 join
     table2 t2
     using (program_id) join
     table3 t3
     using (product_name);