How to unnest and pivot two columns in BigQuery

Question

Say I have a BQ table containing the following information

| id    | test.name     | test.score    |
|----   |-----------    |------------   |
| 1     | a                 


        

Answer 1

One option could be using conditional aggregation

select id, 
       max(case when test.name='a' then test.score end) as a,
       max(case when test.name='b' then test.score end) as b,
       max(case when test.name='c' then test.score end) as c
from 
(
select a.id, t
from `table` as a,
unnest(test) as t
)A group by id