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How to Transfer the Data Between Tables With Different Structures? (Doc ID 1078211.1)

Last updated on AUGUST 01, 2019

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 10.1 to 11.2]
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.

NOTE: In the document content below, the user information and data used represents fictitious data .Any similarity to actual persons, living or dead, is purely coincidental and not intended in any manner.


You want to export the data from a source table and import into an existing target table. The structures of the two tables are different, like in the example below:

-- Structure at source
create table a_tab
   a_col number,
   b_col varchar2(100)

-- Populate source table
insert into a_tab values (1, 'Text 1');
insert into a_tab values (2, 'Text 2');

-- Structure at target
create table a_tab
   x_col number,
   y_col date,
   z_col varchar2(50)

If you export the table a_tab, either with original export utility:

#> exp test/<password> file=a_tab_exp.dmp tables=a_tab

or with DataPump export utility:

#> expdp test/<password> directory=dpu dumpfile=a_tab_expdp.dmp tables=a_tab

and then import the table at target, then you will get:

#> imp test/<password> file=a_tab_exp.dmp tables=a_tab ignore=y


. importing TEST's objects into TEST
. . importing table "A_TAB"
IMP-00058: ORACLE error 904 encountered
ORA-00904: "B_COL": invalid identifier


#> impdp test/<password> directory=dpu dumpfile=a_tab_expdp.dmp tables=a_tab table_exists_action=append


Processing object type TABLE_EXPORT/TABLE/TABLE
ORA-39152: Table "TEST"."A_TAB" exists. Data will be appended to existing table
but all dependent metadata will be skipped due to table_exists_action of append
Processing object type TABLE_EXPORT/TABLE/TABLE_DATA
ORA-31693: Table data object "TEST"."A_TAB" failed to load/unload and is being s
kipped due to error:
ORA-02354: error in exporting/importing data
ORA-02373: Error parsing insert statement for table "TEST"."A_TAB".
ORA-00904: "B_COL": invalid identifier


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