oracle查询时通过分组去除重复行，其实这样写更简洁些

建表：

create table t_test(

pk_id         VARCHAR2(50 BYTE)               not null,
g_name        VARCHAR2(200 BYTE),
f_description VARCHAR2(400 BYTE),
f_order        NUMBER,
constraint pk_t_test primary key (pk_id)
)

插数据：
insert into t_test values('a1','张三','',1);
insert into t_test values('a2','张三','',2);
insert into t_test values('a3','李四','',3);
insert into t_test values('a4','李四','',4);
insert into t_test values('a5','李四','',5);

原博友的写法是：
SELECT *
  FROM (SELECT PK_ID,
               G_NAME,
               F_DESCRIPTION,
               F_ORDER,
               ROW_NUMBER() OVER(PARTITION BY G_NAME ORDER BY F_ORDER) RANK
          FROM T_TEST) T
 WHERE T.RANK = 1;


其实这样写更简洁些~~
SELECT * FROM T_TEST WHERE ROWID IN (
SELECT MIN(ROWID) FROM T_TEST t GROUP BY t.g_name
)