How can I compare multiple tables in Bigquery and get the results in in separate columns?

Question

I have about 3 different tables in the same BigQuery dataset, and they all have the same schema. I need to compare all there tables for the presence of multiple values, and have the results listed in separate columns.

For example: Tables: 'Luxury', 'Economy' and 'SUVs'. They all have columns for 'color', 'price' and 'size'.

I want to query all the tables to get the tables where color = 'red' or color = 'blue'.

This should only return two rows - like:

Luxury	Economy	SUVs
red	red	red
	blue

So in this case, Economy table has red and blue cars, but Luxury and SUVs have only red cars. I have tried, UNION ALL, and INNER JOIN, but they return only one row

Thank you

Answer 1

Consider below approach

select * except(pos) from (
  select * from (
    select distinct color, 'Luxury' source, row_number() over(order by color) pos from Luxury union all
    select distinct color, 'Economy' source, row_number() over(order by color) pos from Economy union all
    select distinct color, 'SUVs' source, row_number() over(order by color) pos from SUVs 
  )
  where color in ('red', 'blue')
)
pivot (any_value(color) for source in ('Luxury', 'Economy', 'SUVs'))

with output like below