1，排在最前面用order by name nulls first;（name是字段名）
eg：select t.name,t.code from table t where t.code!=‘1‘ order by name nulls first;
2，排在最后面order by name nulls last;（name是字段名）
eg：select t.name,t.code from table t where t.code!=‘1‘ order by name nulls last;