insert into test values(3, 'a', 'a', 'a');
insert into test values(3, 'a', 'a', 'a')
*
ERROR at line 1:
ORA...insert into test values(4, 'b', 'b', 'b');
insert into test values(4, 'b', 'b', 'b')
*
ERROR at line 1:
ORA...insert into test values(5, 'a', '', 'a');
insert into test values(5, 'a', '', 'a')
*
ERROR at line 1:
ORA...insert into test values(5, '', '', 'a');
insert into test values(5, '', '', 'a')
*
ERROR at line 1:
ORA