select count(*) from (
select distinct d.* from (
FROM (select distinct contact_id from certs where Certification_Date>=now()-365*1
select distinct trainer from certs where Certification_Date>=now()-365*1
select distinct user from queries where date>=now()-365*1
select distinct contact_id from
(select Event_id from events where date>=now()-365*1) as e
left join parts as p
) AS a LEFT JOIN contacts AS c ON a.contact_id=c.contact_id
) as d
left join CG as e
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