Oracle SQL的问题

有谁能告诉我为什么我会在下面出错：

“ORA-00904:“消息正文”：无效标识符”

当我对Oracle数据库运行下面的查询时

SELECT COMMERCIAL_ID, MIN(dbms_lob.substr(MESSAGE_BODY, 3999, 1)) AS MESSAGE_BODY
FROM DWH_F_MP_MESSAGE_VW
GROUP BY COMMERCIAL_ID;

消息体字段是CLOB

---

似乎

DWH\u F\u MP\u MESSAGE\u VW

不包含名为

MESSAGE\u BODY

的列

下面是一个演示：

SQL> create table dwh_f_mp_message_vw (commercial_id number, message_body clob);

Table created.

SQL> insert into dwh_f_mp_message_vw values (1, 'Littlefoot');

1 row created.

SQL> select commercial_id, min(dbms_lob.substr(message_body, 3999, 1))
  2  from dwh_f_mp_message_vw
  3  group by commercial_id;

COMMERCIAL_ID
-------------
MIN(DBMS_LOB.SUBSTR(MESSAGE_BODY,3999,1))
--------------------------------------------------------------------------------
            1
Littlefoot


SQL> select commercial_id, min(dbms_lob.substr(message_bodyyyyyy, 3999, 1))
  2  from dwh_f_mp_message_vw
  3  group by commercial_id;
select commercial_id, min(dbms_lob.substr(message_bodyyyyyy, 3999, 1))
                                          *
ERROR at line 1:
ORA-00904: "MESSAGE_BODYYYYYY": invalid identifier


SQL>

我建议您运行以下程序：

SQL> desc dwh_f_mp_message_vw
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------
 COMMERCIAL_ID                                      NUMBER
 MESSAGE_BODY                                       CLOB

然后把结果贴在这里（除非你能弄明白；如果是那样的话，请解释一下哪里出了问题）。可能的罪魁祸首是在双引号下创建的列，例如

SQL> drop table dwh_f_mp_message_vw;

Table dropped.

SQL> create table dwh_f_mp_message_vw (commercial_id number, "message_body" clob);

Table created.

SQL> insert into dwh_f_mp_message_vw (commercial_id, message_body) values (1, 'Littlefoot');
insert into dwh_f_mp_message_vw (commercial_id, message_body) values (1, 'Littlefoot')
                                                *
ERROR at line 1:
ORA-00904: "MESSAGE_BODY": invalid identifier


SQL> insert into dwh_f_mp_message_vw (commercial_id, "message_body") values (1, 'Littlefoot');

1 row created.

SQL> desc dwh_f_mp_message_vw
 Name                                      Null?    Type
 ----------------------------------------- -------- -------------------
 COMMERCIAL_ID                                      NUMBER
 message_body                                       CLOB

SQL>

---

如果是这样的话，请去掉双引号。

似乎

DWH\u F\u MP\u MESSAGE\u VW

不包含名为

MESSAGE\u BODY

的列

下面是一个演示：

SQL> create table dwh_f_mp_message_vw (commercial_id number, message_body clob);

Table created.

SQL> insert into dwh_f_mp_message_vw values (1, 'Littlefoot');

1 row created.

SQL> select commercial_id, min(dbms_lob.substr(message_body, 3999, 1))
  2  from dwh_f_mp_message_vw
  3  group by commercial_id;

COMMERCIAL_ID
-------------
MIN(DBMS_LOB.SUBSTR(MESSAGE_BODY,3999,1))
--------------------------------------------------------------------------------
            1
Littlefoot


SQL> select commercial_id, min(dbms_lob.substr(message_bodyyyyyy, 3999, 1))
  2  from dwh_f_mp_message_vw
  3  group by commercial_id;
select commercial_id, min(dbms_lob.substr(message_bodyyyyyy, 3999, 1))
                                          *
ERROR at line 1:
ORA-00904: "MESSAGE_BODYYYYYY": invalid identifier


SQL>

我建议您运行以下程序：

SQL> desc dwh_f_mp_message_vw
 Name                                      Null?    Type
 ----------------------------------------- -------- ----------------
 COMMERCIAL_ID                                      NUMBER
 MESSAGE_BODY                                       CLOB

然后把结果贴在这里（除非你能弄明白；如果是那样的话，请解释一下哪里出了问题）。可能的罪魁祸首是在双引号下创建的列，例如

SQL> drop table dwh_f_mp_message_vw;

Table dropped.

SQL> create table dwh_f_mp_message_vw (commercial_id number, "message_body" clob);

Table created.

SQL> insert into dwh_f_mp_message_vw (commercial_id, message_body) values (1, 'Littlefoot');
insert into dwh_f_mp_message_vw (commercial_id, message_body) values (1, 'Littlefoot')
                                                *
ERROR at line 1:
ORA-00904: "MESSAGE_BODY": invalid identifier


SQL> insert into dwh_f_mp_message_vw (commercial_id, "message_body") values (1, 'Littlefoot');

1 row created.

SQL> desc dwh_f_mp_message_vw
 Name                                      Null?    Type
 ----------------------------------------- -------- -------------------
 COMMERCIAL_ID                                      NUMBER
 message_body                                       CLOB

SQL>

---

如果是这样的话，就不要使用双引号。

仔细看一下第一行末尾的孤立引号。这只是我输入so时的一个拼写错误……这不是问题所在。我据此进行了编辑；谢谢你仔细看一下第一行末尾的孤立引号。这只是我进入的时候的一个输入错误，所以…这不是问题所在。我据此进行了编辑；谢谢你是对的…字段出现在原始基表中，但在视图中丢失了…谢谢你是对的…字段出现在原始基表中，但在视图中丢失了…谢谢