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|
set time_zone="+00:00";
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) not null,
name varchar(100) not null,
mgr int(10),
salary int(10) not null,
constraint `dept-emp-fk`
foreign key (dept_id) references dept (dept_id)
on delete cascade
on update restrict,
constraint `mgr-fk`
foreign key (mgr) references emp (emp_id)
on delete restrict
on update restrict
) with system versioning;
insert into dept (dept_id, name) values (10, "accounting");
insert into emp (emp_id, name, salary, dept_id, mgr) values
(1, "bill", 1000, 10, null),
(20, "john", 500, 10, 1),
(30, "jane", 750, 10,1 );
select row_start into @ts_1 from emp where name="jane";
update emp set mgr=30 where name ="john";
explain extended
with ancestors as (
select e.emp_id, e.name, e.mgr, e.salary from emp as e where name = 'bill'
union
select e.emp_id, e.name, e.mgr, e.salary from emp as e
) select * from ancestors for system_time as of @ts_1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 8 100.00
2 DERIVED e ALL NULL NULL NULL NULL 4 100.00 Using where
3 UNION e ALL NULL NULL NULL NULL 4 100.00 Using where
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 with ancestors as (/* select#2 */ select `test`.`e`.`emp_id` AS `emp_id`,`test`.`e`.`name` AS `name`,`test`.`e`.`mgr` AS `mgr`,`test`.`e`.`salary` AS `salary` from `test`.`emp` FOR SYSTEM_TIME ALL `e` where `test`.`e`.`name` = 'bill' and `test`.`e`.`row_end` > @`ts_1` and `test`.`e`.`row_start` <= @`ts_1` union /* select#3 */ select `test`.`e`.`emp_id` AS `emp_id`,`test`.`e`.`name` AS `name`,`test`.`e`.`mgr` AS `mgr`,`test`.`e`.`salary` AS `salary` from `test`.`emp` FOR SYSTEM_TIME ALL `e` where `test`.`e`.`row_end` > @`ts_1` and `test`.`e`.`row_start` <= @`ts_1`)/* select#1 */ select `ancestors`.`emp_id` AS `emp_id`,`ancestors`.`name` AS `name`,`ancestors`.`mgr` AS `mgr`,`ancestors`.`salary` AS `salary` from `ancestors`
select row_start into @ts_2 from emp where name="john";
explain extended /* All report to 'Bill' */
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr, e.salary
from emp for system_time as of timestamp @ts_1 as e
where name = 'bill'
union
select e.emp_id, e.name, e.mgr, e.salary
from emp for system_time as of timestamp @ts_1 as e,
ancestors as a
where e.mgr = a.emp_id
)
select * from ancestors;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 100.00
2 DERIVED e ALL NULL NULL NULL NULL 4 100.00 Using where
3 RECURSIVE UNION e ALL mgr-fk NULL NULL NULL 4 100.00 Using where
3 RECURSIVE UNION <derived2> ref key0 key0 5 test.e.mgr 2 100.00
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 with recursive ancestors as (/* select#2 */ select `test`.`e`.`emp_id` AS `emp_id`,`test`.`e`.`name` AS `name`,`test`.`e`.`mgr` AS `mgr`,`test`.`e`.`salary` AS `salary` from `test`.`emp` FOR SYSTEM_TIME ALL `e` where `test`.`e`.`name` = 'bill' and `test`.`e`.`row_end` > @`ts_1` and `test`.`e`.`row_start` <= @`ts_1` union /* select#3 */ select `test`.`e`.`emp_id` AS `emp_id`,`test`.`e`.`name` AS `name`,`test`.`e`.`mgr` AS `mgr`,`test`.`e`.`salary` AS `salary` from `test`.`emp` FOR SYSTEM_TIME ALL `e` join `ancestors` `a` where `a`.`emp_id` = `test`.`e`.`mgr` and `test`.`e`.`row_end` > @`ts_1` and `test`.`e`.`row_start` <= @`ts_1`)/* select#1 */ select `ancestors`.`emp_id` AS `emp_id`,`ancestors`.`name` AS `name`,`ancestors`.`mgr` AS `mgr`,`ancestors`.`salary` AS `salary` from `ancestors`
/* All report to 'Bill' */
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr, e.salary
from emp for system_time as of timestamp @ts_1 as e
where name = 'bill'
union
select e.emp_id, e.name, e.mgr, e.salary
from emp for system_time as of timestamp @ts_1 as e,
ancestors as a
where e.mgr = a.emp_id
)
select * from ancestors;
emp_id name mgr salary
1 bill NULL 1000
20 john 1 500
30 jane 1 750
explain extended with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr, e.salary
from emp as e
where name = 'bill'
union
select e.emp_id, e.name, e.mgr, e.salary
from emp as e,
ancestors as a
where e.mgr = a.emp_id
)
select * from ancestors for system_time as of timestamp @ts_1;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 4 100.00
2 DERIVED e ALL NULL NULL NULL NULL 4 100.00 Using where
3 RECURSIVE UNION e ALL mgr-fk NULL NULL NULL 4 100.00 Using where
3 RECURSIVE UNION <derived2> ref key0 key0 5 test.e.mgr 2 100.00
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 with recursive ancestors as (/* select#2 */ select `test`.`e`.`emp_id` AS `emp_id`,`test`.`e`.`name` AS `name`,`test`.`e`.`mgr` AS `mgr`,`test`.`e`.`salary` AS `salary` from `test`.`emp` FOR SYSTEM_TIME ALL `e` where `test`.`e`.`name` = 'bill' and `test`.`e`.`row_end` > @`ts_1` and `test`.`e`.`row_start` <= @`ts_1` union /* select#3 */ select `test`.`e`.`emp_id` AS `emp_id`,`test`.`e`.`name` AS `name`,`test`.`e`.`mgr` AS `mgr`,`test`.`e`.`salary` AS `salary` from `test`.`emp` FOR SYSTEM_TIME ALL `e` join `ancestors` `a` where `a`.`emp_id` = `test`.`e`.`mgr` and `test`.`e`.`row_end` > @`ts_1` and `test`.`e`.`row_start` <= @`ts_1`)/* select#1 */ select `ancestors`.`emp_id` AS `emp_id`,`ancestors`.`name` AS `name`,`ancestors`.`mgr` AS `mgr`,`ancestors`.`salary` AS `salary` from `ancestors`
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr, e.salary
from emp as e
where name = 'bill'
union
select e.emp_id, e.name, e.mgr, e.salary
from emp as e,
ancestors as a
where e.mgr = a.emp_id
)
select * from ancestors for system_time as of timestamp @ts_1;
emp_id name mgr salary
1 bill NULL 1000
20 john 1 500
30 jane 1 750
explain extended with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr, e.salary
from emp as e
where name = 'bill'
union
select e.emp_id, e.name, e.mgr, e.salary
from emp as e,
ancestors as a
where e.mgr = a.emp_id
)
select name from emp where emp_id in (select emp_id from ancestors for system_time as of timestamp @ts_1);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <subquery4> ALL distinct_key NULL NULL NULL 4 100.00
1 PRIMARY emp ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (flat, BNL join)
4 MATERIALIZED <derived2> ALL NULL NULL NULL NULL 4 100.00
2 DERIVED e ALL NULL NULL NULL NULL 4 100.00 Using where
3 RECURSIVE UNION e ALL mgr-fk NULL NULL NULL 4 100.00 Using where
3 RECURSIVE UNION <derived2> ref key0 key0 5 test.e.mgr 2 100.00
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 with recursive ancestors as (/* select#2 */ select `test`.`e`.`emp_id` AS `emp_id`,`test`.`e`.`name` AS `name`,`test`.`e`.`mgr` AS `mgr`,`test`.`e`.`salary` AS `salary` from `test`.`emp` FOR SYSTEM_TIME ALL `e` where `test`.`e`.`name` = 'bill' and `test`.`e`.`row_end` > @`ts_1` and `test`.`e`.`row_start` <= @`ts_1` union /* select#3 */ select `test`.`e`.`emp_id` AS `emp_id`,`test`.`e`.`name` AS `name`,`test`.`e`.`mgr` AS `mgr`,`test`.`e`.`salary` AS `salary` from `test`.`emp` FOR SYSTEM_TIME ALL `e` join `ancestors` `a` where `a`.`emp_id` = `test`.`e`.`mgr` and `test`.`e`.`row_end` > @`ts_1` and `test`.`e`.`row_start` <= @`ts_1`)/* select#1 */ select `test`.`emp`.`name` AS `name` from `test`.`emp` FOR SYSTEM_TIME ALL semi join (`ancestors`) where `test`.`emp`.`emp_id` = `ancestors`.`emp_id` and `test`.`emp`.`row_end` = TIMESTAMP'2038-01-19 03:14:07.999999'
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr, e.salary
from emp as e
where name = 'bill'
union
select e.emp_id, e.name, e.mgr, e.salary
from emp as e,
ancestors as a
where e.mgr = a.emp_id
)
select name from emp where emp_id in (select emp_id from ancestors for system_time as of timestamp @ts_1);
name
bill
john
jane
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr, e.salary
from emp as e
where name = 'bill'
union
select e.emp_id, e.name, e.mgr, e.salary
from emp as e,
ancestors as a
where e.mgr = a.emp_id
)
select * from ancestors for system_time as of @ts_2,
ancestors for system_time as of @ts_2 a2;
emp_id name mgr salary emp_id name mgr salary
1 bill NULL 1000 1 bill NULL 1000
30 jane 1 750 1 bill NULL 1000
20 john 30 500 1 bill NULL 1000
1 bill NULL 1000 30 jane 1 750
30 jane 1 750 30 jane 1 750
20 john 30 500 30 jane 1 750
1 bill NULL 1000 20 john 30 500
30 jane 1 750 20 john 30 500
20 john 30 500 20 john 30 500
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr, e.salary
from emp as e
where name = 'bill'
union
select e.emp_id, e.name, e.mgr, e.salary
from emp as e,
ancestors as a
where e.mgr = a.emp_id
)
select * from ancestors for system_time as of @ts_2,
ancestors for system_time as of now() a2;
ERROR HY000: Conflicting FOR SYSTEM_TIME clauses in WITH RECURSIVE
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr, e.salary
from emp as e
where name = 'bill'
union
select e.emp_id, e.name, e.mgr, e.salary
from emp as e,
ancestors as a
where e.mgr = a.emp_id
)
select * from ancestors,
ancestors for system_time as of @ts_2 a2;
ERROR HY000: Conflicting FOR SYSTEM_TIME clauses in WITH RECURSIVE
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr, e.salary
from emp as e
where name = 'bill'
union
select e.emp_id, e.name, e.mgr, e.salary
from emp as e,
ancestors as a
where e.mgr = a.emp_id
)
select * from ancestors for system_time as of @ts_2,
ancestors a2;
ERROR HY000: Conflicting FOR SYSTEM_TIME clauses in WITH RECURSIVE
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr, e.salary
from emp as e
where name = 'bill'
union
select e.emp_id, e.name, e.mgr, e.salary
from emp as e,
ancestors as a
where e.mgr = a.emp_id
)
select * from ancestors for system_time as of @ts_2
where emp_id in (select * from ancestors);
ERROR HY000: Conflicting FOR SYSTEM_TIME clauses in WITH RECURSIVE
# SYSTEM_TIME to internal recursive instance is prohibited
with recursive cte as
(
select * from emp
union all
select * from cte for system_time as of @ts_1
)
select * from cte;
ERROR HY000: Table `cte` is not system-versioned
create or replace table emp ( emp_id int, name varchar(127), mgr int) with system versioning;
create or replace table addr ( emp_id int, address varchar(100)) with system versioning;
insert emp values (1, 'bill', 0), (2, 'bill', 1), (3, 'kate', 1);
insert addr values (1, 'Moscow'), (2, 'New York'), (3, 'London');
set @ts=now(6);
delete from emp;
delete from addr;
with recursive
ancestors
as
(
select e.emp_id, e.name, e.mgr
from emp for system_time as of timestamp @ts as e
where name = 'bill'
union
select ee.emp_id, ee.name, ee.mgr
from emp for system_time as of timestamp @ts as ee, ancestors as a
where ee.mgr = a.emp_id
)
select * from ancestors;
emp_id name mgr
1 bill 0
2 bill 1
3 kate 1
insert emp values (4, 'john', 1);
insert addr values (4, 'Paris');
with ancestors as (select * from emp natural join addr) select * from ancestors;
emp_id name mgr address
4 john 1 Paris
with ancestors as (select * from emp natural join addr) select * from ancestors for system_time all;
emp_id name mgr address
1 bill 0 Moscow
2 bill 1 New York
3 kate 1 London
4 john 1 Paris
with ancestors as (select * from (select * from emp natural join addr) for system_time all as t) select * from ancestors;
emp_id name mgr address
1 bill 0 Moscow
2 bill 1 New York
3 kate 1 London
4 john 1 Paris
select * from (select * from emp natural join addr) for system_time all as t;
emp_id name mgr address
1 bill 0 Moscow
2 bill 1 New York
3 kate 1 London
4 john 1 Paris
drop table emp;
drop table dept;
drop table addr;
|
