(select nickname from qrtable where openid in
(
select popenid from qrtable where openid='oj2ya0-OSplH0Vf4CArgtzEFTnf4'se
阅读背景：
mysql查询查询树结构,通过树结构查询一个自己昵称和父级节点的昵称
来源：互联网
(select nickname from qrtable where openid in
(
select popenid from qrtable where openid='oj2ya0-OSplH0Vf4CArgtzEFTnf4'se
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