drop table后，约束会被删除吗？

create table test1(
id number
);

insert into test1 values(11);
insert into test1 values(22);
insert into test1 values(33);
commit;

create or replace synonym t1 for test1;
create or replace view t1_v as
select * from test1;
create sequence t1_s start with 101;
alter table test1 add constraint test1_pk primary key(id);

--查看同义词
select * from t1;
--查询视图
select * from t1_V;
--查询序列
select * from dba_sequences where sequence_name = upper('t1_s');
--查询约束
select * from dba_constraints WHERE OWNER='SYS01';
select * from dba_segments where owner ='SYS01';

--删除表
drop table test1;
-- 1.同义词失效：ORA-00980: 同义词转换不再有效
-- 2.视图失效：ORA-04063: view "SYS01.T1_V" 有错误
-- 3.序列依旧存在
-- 4.约束被删除了