Spoiler: solution to this is . the solution was really simple. I'm trying to insert data from an external table. Here's the code I'm trying to use: INSERT /*+ ignore_row_on_dupkey_index ( consruct ( construct_id ) ) */ INTO construct        (construct_id,       n_term ,       enz_name,       c_term,       cpp,       mutations,       mw_kda) SELECT *     FROM EXTERNAL ((       construct_id NUMBER(10),       n_term VARCHAR2 (50),       enz_name VARCHAR2 (50),       c_term VARCHAR2 (50),       cpp VARCHAR2 (50),       mutations VARCHAR2 (50),       mw_kda NUMBER (7,3))      TYPE ORACLE_LOADER     DEFAULT DIRECTORY data_to_input     ACCESS PARAMETERS (         RECORDS DELIMITED BY NEWLINE         SKIP 1         BADFILE bad_files:'badflie_insert_into_construct_from_construct.bad'         FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '&quot;'         MISSING FIELD VALUES ARE NULL          )      LOCATION ('CONSTRUCT.CSV')     REJECT LIMIT UNLIMITED) ext          WHERE NOT EXISTS (         SELECT * FROM construct c         WHERE c.n_term = ext.n_term         AND c.enz_name = ext.enz_name         AND c.c_term = ext.c_term         AND c.cpp = ext.cpp         AND c.mutations = ext.mutations     );  But now i get this error: Error at Command Line : 171 Column : 7 Error report - SQL Error: ORA-00957: duplicate column name 00957. 00000 -  &quot;duplicate column name&quot;  Line 171 is the last line of this part INSERT /*+ ignore_row_on_dupkey_index ( consruct ( construct_id ) ) */ INTO construct        (construct_id,       n_term ,       enz_name,       c_term,       cpp,       mutations,       mw_kda)  Which is clearly not a duplicate column. If I do: INSERT /*+ ignore_row_on_dupkey_index ( consruct ( construct_id ) ) */ INTO construct      (construct_id,      n_term,      enz_name,      c_term,      cpp,      mutations,      mw_kda) SELECT *     FROM EXTERNAL ((       ext.construct_id NUMBER (10),       ext.n_term VARCHAR2 (50),       ext.enz_name VARCHAR2 (50),       ext.c_term VARCHAR2 (50),       ext.cpp VARCHAR2 (50),       ext.mutations VARCHAR2 (50),       ext.mw_kda NUMBER (7,3))      TYPE ORACLE_LOADER     DEFAULT DIRECTORY data_to_input     ACCESS PARAMETERS (         RECORDS DELIMITED BY NEWLINE         SKIP 1         BADFILE bad_files:'badflie_insert_into_construct_from_construct.bad'         FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '&quot;'         MISSING FIELD VALUES ARE NULL          )      LOCATION ('CONSTRUCT.CSV')     REJECT LIMIT UNLIMITED) ext          WHERE NOT EXISTS (         SELECT * FROM construct c         WHERE c.n_term = ext.n_term         AND c.enz_name = ext.enz_name         AND c.c_term = ext.c_term         AND c.cpp = ext.cpp         AND c.mutations = ext.mutations     );  I get Error at Command Line : 174 Column : 10 Error report - SQL Error: ORA-00902: invalid datatype 00902. 00000 -  &quot;invalid datatype&quot;  Line 171 is ext.construct_id NUMBER (10),  Background: The reason I'm listing the columns out instead of just saying insert into construct select  is because I have a virtual column in the construct table taht's defined like this: construct VARCHAR2 (200) GENERATED ALWAYS AS  (n_term || '-' || enz_name || '-' ||c_term || ' ' ||mutations) VIRTUAL, And there's no corresponding column in the csv file for it. The second column in the ERD called CONSTRUCT is defined like this:  Edit: originally, I defined datatypes for columns from the table that I was inserting into. This was a mistake and I deleted that code, replacing it with the new version for readability. It was taking up a lot of room in this post. (Edit: originally, I defined datatypes for columns from the table that I was inserting into. This was a mistake and I deleted that code, replacing it with the new version for readability. It was taking up a lot of room in this post.)
I'm trying to insert data from an external table. INSERT /*+ ignore_row_on_dupkey_index ( consruct ( construct_id ) ) */ INTO construct        (construct_id,       n_term ,       enz_name,       c_term,       cpp,       mutations,       mw_kda) SELECT *     FROM EXTERNAL ((       construct_id NUMBER(10),       n_term VARCHAR2 (50),       enz_name VARCHAR2 (50),       c_term VARCHAR2 (50),       cpp VARCHAR2 (50),       mutations VARCHAR2 (50),       mw_kda NUMBER (7,3))      TYPE ORACLE_LOADER     DEFAULT DIRECTORY data_to_input     ACCESS PARAMETERS (         RECORDS DELIMITED BY NEWLINE         SKIP 1         BADFILE bad_files:'badflie_insert_into_construct_from_construct.bad'         FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '&quot;'         MISSING FIELD VALUES ARE NULL          )      LOCATION ('CONSTRUCT.CSV')     REJECT LIMIT UNLIMITED) ext          WHERE NOT EXISTS (         SELECT * FROM construct c         WHERE c.n_term = ext.n_term         AND c.enz_name = ext.enz_name         AND c.c_term = ext.c_term         AND c.cpp = ext.cpp         AND c.mutations = ext.mutations     );  But now i get this error: Error at Command Line : 171 Column : 7 Error report - SQL Error: ORA-00957: duplicate column name 00957. 00000 -  &quot;duplicate column name&quot;  Line 171 is the last line of this part INSERT /*+ ignore_row_on_dupkey_index ( consruct ( construct_id ) ) */ INTO construct        (construct_id,       n_term ,       enz_name,       c_term,       cpp,       mutations,       mw_kda)  Which is clearly not a duplicate column. If I do: INSERT /*+ ignore_row_on_dupkey_index ( consruct ( construct_id ) ) */ INTO construct      (construct_id,      n_term,      enz_name,      c_term,      cpp,      mutations,      mw_kda) SELECT *     FROM EXTERNAL ((       ext.construct_id NUMBER (10),       ext.n_term VARCHAR2 (50),       ext.enz_name VARCHAR2 (50),       ext.c_term VARCHAR2 (50),       ext.cpp VARCHAR2 (50),       ext.mutations VARCHAR2 (50),       ext.mw_kda NUMBER (7,3))      TYPE ORACLE_LOADER     DEFAULT DIRECTORY data_to_input     ACCESS PARAMETERS (         RECORDS DELIMITED BY NEWLINE         SKIP 1         BADFILE bad_files:'badflie_insert_into_construct_from_construct.bad'         FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '&quot;'         MISSING FIELD VALUES ARE NULL          )      LOCATION ('CONSTRUCT.CSV')     REJECT LIMIT UNLIMITED) ext          WHERE NOT EXISTS (         SELECT * FROM construct c         WHERE c.n_term = ext.n_term         AND c.enz_name = ext.enz_name         AND c.c_term = ext.c_term         AND c.cpp = ext.cpp         AND c.mutations = ext.mutations     );  I get Error at Command Line : 174 Column : 10 Error report - SQL Error: ORA-00902: invalid datatype 00902. 00000 -  &quot;invalid datatype&quot;  Line 171 is ext.construct_id NUMBER (10),
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