set default_storage_engine=innodb;
create or replace table dept (
dept_id int(10) primary key, 
name varchar(100)
)
with system versioning;
create or replace table emp (
emp_id int(10) primary key,
dept_id int(10),
name varchar(100),
salary int(10),
constraint `dept-emp-fk`
    foreign key (dept_id) references dept (dept_id)
on delete restrict
on update restrict
) 
with system versioning;
select now() into @ts_0;
insert into dept (dept_id, name) values (10, "accounting");
commit;
select row_start into @ts_1 from dept where dept_id=10;
insert into emp (emp_id, name, salary, dept_id) values (1, "bill", 1000, 10);
commit;
select row_start into @ts_2 from emp where name="bill";
select * from emp;
emp_id	dept_id	name	salary
1	10	bill	1000
update emp set salary=2000 where name="bill";
commit;
select row_start into @ts_3 from emp where name="bill";
select * from emp;
emp_id	dept_id	name	salary
1	10	bill	2000
select * from emp for system_time as of timestamp @ts_2;
emp_id	dept_id	name	salary
1	10	bill	1000
select * from emp for system_time as of timestamp @ts_3;
emp_id	dept_id	name	salary
1	10	bill	2000
select * from emp e, dept d
where d.dept_id = 10
and d.dept_id = e.dept_id;
emp_id	dept_id	name	salary	dept_id	name
1	10	bill	2000	10	accounting
select * from
emp for system_time from timestamp @ts_1 to timestamp @ts_2 e,
dept for system_time from timestamp @ts_1 to timestamp @ts_2 d
where d.dept_id = 10
and d.dept_id = e.dept_id;
emp_id	dept_id	name	salary	dept_id	name
set statement system_versioning_asof=@ts_0 for
select * from emp e, dept d
where d.dept_id = 10
and d.dept_id = e.dept_id;
emp_id	dept_id	name	salary	dept_id	name
set statement system_versioning_asof=@ts_1 for
select * from emp e, dept d
where d.dept_id = 10
and d.dept_id = e.dept_id;
emp_id	dept_id	name	salary	dept_id	name
set statement system_versioning_asof=@ts_2 for
select * from emp e, dept d
where d.dept_id = 10
and d.dept_id = e.dept_id;
emp_id	dept_id	name	salary	dept_id	name
1	10	bill	1000	10	accounting
set statement system_versioning_asof=@ts_3 for
select * from emp e, dept d
where d.dept_id = 10
and d.dept_id = e.dept_id;
emp_id	dept_id	name	salary	dept_id	name
1	10	bill	2000	10	accounting
drop table emp, dept;
create table t1 (
a timestamp(6),
b timestamp(6) generated always as (a + interval 1 day),
c timestamp(6) generated always as (a + interval 1 month) stored,
d timestamp(6) generated always as row start,
e timestamp(6) generated always as row end,
period for system_time(d,e)
) with system versioning;
show columns from t1;
Field	Type	Null	Key	Default	Extra
a	timestamp(6)	NO		current_timestamp(6)	on update current_timestamp(6)
b	timestamp(6)	YES		NULL	VIRTUAL GENERATED
c	timestamp(6)	YES		NULL	STORED GENERATED
d	timestamp(6)	NO		NULL	STORED GENERATED
e	timestamp(6)	NO		NULL	STORED GENERATED
select table_catalog,table_schema,table_name,column_name,ordinal_position,column_default,is_nullable,data_type,character_maximum_length,character_octet_length,numeric_precision,numeric_scale,datetime_precision,character_set_name,collation_name,column_type,column_key,extra,column_comment,is_generated,generation_expression,'---' from information_schema.columns where table_name='t1';
table_catalog	def
table_schema	test
table_name	t1
column_name	a
ordinal_position	1
column_default	current_timestamp(6)
is_nullable	NO
data_type	timestamp
character_maximum_length	NULL
character_octet_length	NULL
numeric_precision	NULL
numeric_scale	NULL
datetime_precision	6
character_set_name	NULL
collation_name	NULL
column_type	timestamp(6)
column_key	
extra	on update current_timestamp(6)
column_comment	
is_generated	NEVER
generation_expression	NULL
---	---
table_catalog	def
table_schema	test
table_name	t1
column_name	b
ordinal_position	2
column_default	NULL
is_nullable	YES
data_type	timestamp
character_maximum_length	NULL
character_octet_length	NULL
numeric_precision	NULL
numeric_scale	NULL
datetime_precision	6
character_set_name	NULL
collation_name	NULL
column_type	timestamp(6)
column_key	
extra	VIRTUAL GENERATED
column_comment	
is_generated	ALWAYS
generation_expression	`a` + interval 1 day
---	---
table_catalog	def
table_schema	test
table_name	t1
column_name	c
ordinal_position	3
column_default	NULL
is_nullable	YES
data_type	timestamp
character_maximum_length	NULL
character_octet_length	NULL
numeric_precision	NULL
numeric_scale	NULL
datetime_precision	6
character_set_name	NULL
collation_name	NULL
column_type	timestamp(6)
column_key	
extra	STORED GENERATED
column_comment	
is_generated	ALWAYS
generation_expression	`a` + interval 1 month
---	---
table_catalog	def
table_schema	test
table_name	t1
column_name	d
ordinal_position	4
column_default	NULL
is_nullable	NO
data_type	timestamp
character_maximum_length	NULL
character_octet_length	NULL
numeric_precision	NULL
numeric_scale	NULL
datetime_precision	6
character_set_name	NULL
collation_name	NULL
column_type	timestamp(6)
column_key	
extra	STORED GENERATED
column_comment	
is_generated	ALWAYS
generation_expression	ROW START
---	---
table_catalog	def
table_schema	test
table_name	t1
column_name	e
ordinal_position	5
column_default	NULL
is_nullable	NO
data_type	timestamp
character_maximum_length	NULL
character_octet_length	NULL
numeric_precision	NULL
numeric_scale	NULL
datetime_precision	6
character_set_name	NULL
collation_name	NULL
column_type	timestamp(6)
column_key	
extra	STORED GENERATED
column_comment	
is_generated	ALWAYS
generation_expression	ROW END
---	---
drop table t1;