SQL> select banner from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE    11.2.0.3.0      Production
TNS for 64-bit Windows: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production

SQL> INSERT INTO xxx_square (A)
  2                       VALUES
  3                         ('123456789012345');

1 row created.

SQL> SELECT *
  2  FROM xxx_square;

A
--------------------------------------------------------------------------------
B
--------------------------------------------------------------------------------
123456789012345
123456789012345123456789012345


SQL>