base1 as (select first_block_number + 1 as second_block_number, block_timestamp from base),

info as (select ft.block_height as bn, timestampdiff('SECOND', base1.BLOCK_TIMESTAMP, base.block_timestamp) AS time_diff

from flow.core.fact_transactions ft

inner join base on base.first_block_number = ft.block_height

inner join base1 on base1.second_block_number = ft.block_height)

select sum(time_diff)/count(bn) as average_block_time, 'Flow' as label

from info