select
a2.area_id as parent_id,
a2.area_name as parent_name,
a1.area_id as child_id,
a1.area_name as child_name
from area as a1
left join area as a2
on a1.parent_id = a2.area_id
单表sql查询省市县
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转载自blog.csdn.net/Lune2018/article/details/81034159
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