1、
select mothername from a ,(select id from(select id,count(*) count from b group by id) where count=2) c where a.id=c.id 2、
select mothername from a ,(select id from(select id,count(*) count from b group by id having childsex=0 and count=2) c where a.id=c.id
select mothername from a ,(select id from(select id,count(*) count from b group by id) where count=2) c where a.id=c.id 2、
select mothername from a ,(select id from(select id,count(*) count from b group by id having childsex=0 and count=2) c where a.id=c.id
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