如何从ug1表中提取第二个名称字段?select ug.name, ug.email, ugwhere ug.id in (SELECT gm.id_user FROM group_memberas gm
where id_group in (SELECT ug1.id from user_group as ug1where ug1.btype='
[type_id], e.nameJOIN user_group ug ON ug.[type_id], e.nameJOIN user_group ug ON ug.[type_id], e.namevar A = M.users
.Join(M.user_groups, u => u.id, ug => ug.user_id, (u, ug) =>