Hi Team,

Please check below case are we missing something in 12c ? or incorrect in syntactical wise ?


SQL> select banner from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
PL/SQL Release 11.2.0.4.0 - Production
CORE 11.2.0.4.0 Production
TNS for Linux: Version 11.2.0.4.0 - Production
NLSRTL Version 11.2.0.4.0 - Production

SQL> create sequence s;

Sequence created.

SQL> create table t ( x int default s.nextval primary key, y varchar2(30) );
create table t ( x int default s.nextval primary key, y varchar2(30) )
*
ERROR at line 1:
ORA-00984: column not allowed here


+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++



SQL> select banner from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
PL/SQL Release 12.1.0.2.0 - Production
CORE 12.1.0.2.0 Production
TNS for Linux: Version 12.1.0.2.0 - Production
NLSRTL Version 12.1.0.2.0 - Production

SQL> create sequence s;

Sequence created.

SQL> create table t ( x int default s.nextval primary key, y varchar2(30) );

Table created.

SQL>


++ Why issue in 11g
++ How 12c Reading it properly
++ What needs to be done to correct the issue in 11g



Thanks,