Create table from view giving error

Question

i am trying to creating a table from view it is giving following error. can you please help
create table jd as
select * from A.ab_v where 1=2;
error
ORA-01723
zero columns not allowed

Answer 1

As others already pointed out you have NULL as view column(s). You need to either modify view and use CAST(NULL AS desired-type). For example:
SQL> create or replace
  2    view v1
  3      as
  4        select  null new_date
  5          from dual
  6  /
View created.
SQL> create table tbl
  2    as
  3      select  *
  4        from  v1
  5  /
    select  *
ERROR at line 3:
ORA-01723: zero-length columns are not allowed
SQL> create or replace
  2    view v1
  3      as
  4        select  cast(null as date) new_date
  5          from dual
  6  /
View created.
SQL> create table tbl
  2    as
  3      select  *
  4        from  v1
  5  /
Table created.
SQL> drop table tbl
  2  /
Table dropped.
SQL> create or replace
  2    view v1
  3      as
  4        select  cast(null as number) new_number
  5          from  dual
  6  /
View created.
SQL> create table tbl
  2    as
  3      select  *
  4        from  v1
  5  /
Table created.
SQL>  Or list individual view columns with NULL CASTing in CTAS:
SQL> create or replace
  2    view v1
  3      as
  4        select  null new_date
  5          from dual
  6  /
View created.
SQL> create table tbl
  2     as
  3       select  cast(new_date as date) new_date
  4         from  v1
  5  /
Table created.
SQL> desc tbl
Name                                      Null?    Type
NEW_DATE                                           DATE
SQL> set null NULL
SQL> select  *
  2    from  tbl
  3  /
NEW_DATE
NULL
SQL> SY.