Oracle DBMS_ROWID 与 ORA-01446 说明

 

 

一网友说参考个人Blog，执行SQL 报错：

http://blog.csdn.net/tianlesoftware/article/details/6529346

 

SELECTROWID,

      DBMS_ROWID.rowid_relative_fno (ROWID)rel_fno,

      DBMS_ROWID.rowid_block_number (ROWID)blockno,

      DBMS_ROWID.rowid_row_number (ROWID)rowno

 FROMuser_objects

 WHEREobject_id =100;

 

selectrowid,dbms_rowid.rowid_relative_fno(rowid)rel_fno,dbms_rowid.rowid_block_number(rowid)blockno,dbms_rowid.rowid_row_number(rowid)rowno fromuser_objects where  object_id=100

      *

ERRORatline 1:

ORA-01446:cannot selectROWIDfrom,orsample,aviewwithDISTINCT,GROUPBY,etc.

 

[oracle@dave ~]$ oerr ora 1446

01446, 00000, "cannot select ROWID from, orsample, a view with DISTINCT, GROUP BY, etc."

// *Cause:

// *Action:

[oracle@dave ~]$

 

开始我扫了一眼，觉得和版本或者bug有关系，由于这个SQL我也执行过不少，一直都没有遇到过问题。

 

在MOS上搜了一下，还真找到2个相关的Bug：

（1）10.2.0.5以后的版本，可能遇到这个bug：

ORA-1445 or ORA-1446 Referencing ROWID from a Viewwith Subquery (文档 ID 1364607.1)

 

（2）Oracle12.0.0的，可能遇到这个bug：

Select from AR_LOCATION_VALUES_DFV ErrorsORA-01446: Cannot Select Rowid From, Or Sample, A View With Distinct (文档 ID 980435.1)

 

但这里明显和咱们的状况不符不符合。又仔细看了一眼，知道缘由在哪了：

 

下面是我Blog里的原SQL:

SQL> SELECT

  2    dbms_rowid.rowid_relative_fno(rowid)REL_FNO,

  3    dbms_rowid.rowid_block_number(rowid)BLOCKNO,

  4    empno, ename

  5  FROM emp WHERE empno =7369;

 

   REL_FNO    BLOCKNO      EMPNOENAME

---------- ---------- ---------- ----------

4         20       7369SMITH

 

 

 

网页的SQL:

SELECTROWID,

      DBMS_ROWID.rowid_relative_fno (ROWID)rel_fno,

      DBMS_ROWID.rowid_block_number (ROWID)blockno,

      DBMS_ROWID.rowid_row_number (ROWID)rowno

 FROMuser_objects

 WHEREobject_id =100;

 

他查询的是user_objects 视图，而非物理表。

 

因此咱们这里的错误：

ORA-01446:cannot selectROWIDfrom,orsample,aviewwithDISTINCT,GROUPBY,etc.

 

就是由于USER_OBJECTS 视图里的代码致使的。

 

采用实际的物理表，就不会出现这种问题：

 

SQL> create table dave as select * from dba_objects;

Table created.

 

SQL> SELECT

  2    dbms_rowid.rowid_relative_fno(rowid)REL_FNO,

  3    dbms_rowid.rowid_block_number(rowid)BLOCKNO,

  4    dbms_rowid.rowid_row_number(rowid) ROWNO,

  5    OBJECT_NAME

  6  FROM dave WHERE OBJECT_ID = 20;

 

  REL_FNO    BLOCKNO      ROWNO    OBJECT_NAME                                                                    

---------- --------- --------  --------------------------------------

    1          92737          0        ICOL$

 

 

 

 

 

 

 

 

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