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gaia data release 3 documentation

16.4 ADQL queries

16.4.2 General statistics 

select count(distinct dr2_source_id)
from edr3.dr2_neighbourhood as xm
left outer join edr3.gaia_source as gaia3
  on xm.dr2_source_id = gaia3.source_id
where gaia3.source_id is null

select count(distinct dr2_source_id)
from edr3.dr2_neighbourhood as xm

select count(distinct dr2_source_id)
from edr3.dr2_neighbourhood as xm
where angular_distance < 100