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gaia early data release 3 documentation

9.4 ADQL queries

9.4.4 Gaia DR2 source_id within and without Gaia EDR3 distance histogram

select round(angular_distance) as mas, count(*) as n
from edr3.dr2_neighbourhood as xm
join gaiadr2.gaia_source as gaia2
  on xm.dr2_source_id = gaia2.source_id
where dr2_source_id = dr3_source_id
  and gaia2.random_index < 10000000
group by mas
order by mas
select mas, count(*) as n
from (
  select dr2_source_id, min(round(angular_distance)) as mas
  from edr3.dr2_neighbourhood as xm
  left outer join edr3.gaia_source as gaia3
    on gaia3.source_id = xm.dr2_source_id
  join gaiadr2.gaia_source as gaia2
    on xm.dr2_source_id = gaia2.source_id
  where gaia3.source_id is null
    and gaia2.random_index < 10000000
  group by dr2_source_id
) as subquery
group by mas
order by mas
select round(angular_distance) as mas, count(*) as n
from edr3.dr2_neighbourhood as xm
left outer join edr3.gaia_source as gaia3
  on gaia3.source_id = xm.dr2_source_id
join gaiadr2.gaia_source as gaia2
  on xm.dr2_source_id = gaia2.source_id
where gaia3.source_id is null
  and gaia2.random_index < 10000000
group by mas
order by mas