You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near As quilified from select nid pidentity_role punit_id As unit a
这句SQL语句存在语法错误，需要查看对应的MariaDB服务器版本手册来确定正确的语法使用方法。错误出现在第6行附近。
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