Gettin error while setting column as primary key

Question

Hi I am trying to extract data from XML file
and create one custom table
Its working fine when I try following code
CREATE TABLE xx_PER_ALL_VACANCIES
  AS (SELECT x.* FROM hr_api_transactions t, xmltable('//PerAllVacanciesEORow' passing xmltype(transaction_document) columns location_id NUMBER path 'LocationId', organization_id NUMBER path 'OrganizationId', name VARCHAR2(100) path 'Name', creation_date VARCHAR2(15) path 'CreationDate',PeopleGroupId  NUMBER path 'PeopleGroupId',REQUISITION_ID  NUMBER(15)path 'RequisitionId',COMMENTS LONG() path 'Comments')
  x
WHERE t.transaction_ref_table = 'PER_ALL_VACANCIES');but when I try to make Name column as primary key then it gives an error
following is code
CREATE TABLE xx_PER_ALL_VACANCIES
  AS (SELECT x.* FROM hr_api_transactions t, xmltable('//PerAllVacanciesEORow' passing xmltype(transaction_document) columns location_id NUMBER path 'LocationId', organization_id NUMBER path 'OrganizationId', name NOT NULL VARCHAR2(100) path 'Name', creation_date VARCHAR2(15) path 'CreationDate',PeopleGroupId  NUMBER path 'PeopleGroupId',REQUISITION_ID  NUMBER(15)path 'RequisitionId',COMMENTS LONG() path 'Comments')
  x
WHERE t.transaction_ref_table = 'PER_ALL_VACANCIES');following is error
Error at Command Line:2 Column:214
Error report:
SQL Error: ORA-00902: invalid datatype
00902. 00000 - "invalid datatype"
*Cause:   
*Action:also it gives error when I takes data type as long() for column Comments
Error at Command Line:2 Column:392
Error report:
SQL Error: ORA-00907: missing right parenthesis
00907. 00000 - "missing right parenthesis"
*Cause:   
*Action:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

Answer 1

LONG is not ( and never will be, so don't bother asking) supported by XMLTable. You should use CLOB or BLOB.
SQL> drop table HR_API_TRANSACTIONS
  2  /
Table dropped.
SQL> drop table xx_PER_ALL_VACANCIES
  2  /
Table dropped.
SQL> create table HR_API_TRANSACTIONS
  2  (
  3    TRANSACTION_REF_TABLE VARCHAR2(32),
  4    TRANSACTION_DOCUMENT  CLOB
  5  )
  6  /
Table created.
SQL> CREATE TABLE xx_PER_ALL_VACANCIES
  2  AS
  3  (
  4    SELECT x.*
  5      FROM hr_api_transactions t,
  6           xmltable
  7           (
  8              '//PerAllVacanciesEORow'
  9              passing xmltype(transaction_document)
10              columns location_id NUMBER        path 'LocationId',
11              organization_id     NUMBER        path 'OrganizationId',
12              name                VARCHAR2(100) path 'Name',
13              creation_date       VARCHAR2(15)  path 'CreationDate',
14              PeopleGroupId       NUMBER        path 'PeopleGroupId',
15              REQUISITION_ID      NUMBER(15)    path 'RequisitionId',
16              COMMENTS            LONG()        path 'Comments'
17           )  x
18     WHERE t.transaction_ref_table = 'PER_ALL_VACANCIES'
19  )
20  /
            COMMENTS            LONG()        path 'Comments'
ERROR at line 16:
ORA-00907: missing right parenthesis
SQL> CREATE TABLE xx_PER_ALL_VACANCIES
  2  AS
  3  (
  4    SELECT x.*
  5      FROM hr_api_transactions t,
  6           xmltable
  7           (
  8              '//PerAllVacanciesEORow'
  9              passing xmltype(transaction_document)
10              columns location_id NUMBER        path 'LocationId',
11              organization_id     NUMBER        path 'OrganizationId',
12              name                VARCHAR2(100) path 'Name',
13              creation_date       VARCHAR2(15)  path 'CreationDate',
14              PeopleGroupId       NUMBER        path 'PeopleGroupId',
15              REQUISITION_ID      NUMBER(15)    path 'RequisitionId',
16              COMMENTS            LONG          path 'Comments'
17           ) x
18     WHERE t.transaction_ref_table = 'PER_ALL_VACANCIES'
19  )
20  /
ERROR at line 19:
ORA-00997: illegal use of LONG datatype
SQL> CREATE TABLE xx_PER_ALL_VACANCIES
  2  AS
  3  (
  4    SELECT x.*
  5      FROM hr_api_transactions t,
  6           xmltable
  7           (
  8              '//PerAllVacanciesEORow'
  9              passing xmltype(transaction_document)
10              columns location_id NUMBER        path 'LocationId',
11              organization_id     NUMBER        path 'OrganizationId',
12              name                VARCHAR2(100) path 'Name',
13              creation_date       VARCHAR2(15)  path 'CreationDate',
14              PeopleGroupId       NUMBER        path 'PeopleGroupId',
15              REQUISITION_ID      NUMBER(15)    path 'RequisitionId',
16              COMMENTS            CLOB          path 'Comments'
17           )  x
18     WHERE t.transaction_ref_table = 'PER_ALL_VACANCIES'
19  )
20  /
Table created.
SQL>