SQL> create table dss_dev.a_1(a1 varchar(5) primary key not null,a2 varchar(5));

Table created

SQL> create table dss_dev.b_1(b1 varchar(5) primary key not null,b2 varchar(5));

Table created

SQL> 
SQL> create or replace trigger dss_dev.a_test1_1
  2  after insert
  3  on a_1
  4  for each row
  5  
  6  begin
  7  
  8  insert into b_1(b1,b2) values('1','2');
  9  
 10  end ;
 11  /

Trigger created

SQL>

------解决方案--------------------

SQL code

把空行去掉试试，因为在sqlplus中连续的两个空行就会导致语句结束.
CREATE OR REPLACE TRIGGER WL08CK1.A_TEST1
  AFTER INSERT ON WL08CK1.A
  FOR EACH ROW
BEGIN
  INSERT INTO B (B1, B2) VALUES ('1', '2');
END;
/

------解决方案--------------------

违反的主键约束所以出错!