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select ks.id, ks.keyword, count(d.keyword) as count1 from
(select id,keyword from keywords where pid=『父亲ID』) ks
left join keywords d on d.pid=ks.id group by ks.id
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select ks.id, ks.keyword, count(d.keyword) as count1 from
(select id,keyword from keywords where pid=『父亲ID』) ks
left join keywords d on d.pid=ks.id group by ks.id
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