config root man

create table emp (
id int primary key auto_increment,
name varchar(256) not null,
manager int,
index(manager)) engine = ndb;
alter table emp add constraint fkname foreign key (manager) references emp(id) on update restrict on delete cascade;
insert into emp values
(1, 'larry', null)
,(2, 'eddie', 1)
,(3, 'tomas', 2)
,(4, 'ricky', 2)
,(5, 'edwin', 2)
,(6, 'bockie', 3)
,(7, 'jonas', 6)
,(8, 'magnus', 6)
,(9, 'frasse', 6)
,(10, 'samuel', 7)
,(11, 'jonatan', 7)
,(12, 'wille', 8);
select * from emp order by 1;
id	name	manager
1	larry	NULL
2	eddie	1
3	tomas	2
4	ricky	2
5	edwin	2
6	bockie	3
7	jonas	6
8	magnus	6
9	frasse	6
10	samuel	7
11	jonatan	7
12	wille	8
begin;
delete from emp where id=6;
select * from emp order by 1;
id	name	manager
1	larry	NULL
2	eddie	1
3	tomas	2
4	ricky	2
5	edwin	2
rollback;
select * from emp order by 1;
id	name	manager
1	larry	NULL
2	eddie	1
3	tomas	2
4	ricky	2
5	edwin	2
6	bockie	3
7	jonas	6
8	magnus	6
9	frasse	6
10	samuel	7
11	jonatan	7
12	wille	8
alter table emp drop foreign key fkname;
drop table emp;
create table tree (
id int primary key,
value varchar(256) not null,
parent int null,
left_child int null,
right_child int null,
index (parent),
unique (left_child),
unique (right_child)) engine = ndb;
insert into tree values (0, '3-root',  null, 1,2);
insert into tree values (1, '1-inner',    0, 3,4);
insert into tree values (2, '5-inner',    0, 5,6);
insert into tree values (3, '0-leaf',     1, null, null);
insert into tree values (4, '2-leaf',     1, null, null);
insert into tree values (5, '4-leaf',     2, null, null);
insert into tree values (6, '6-leaf',     2, null, null);
select * from tree order by 1;
id	value	parent	left_child	right_child
0	3-root	NULL	1	2
1	1-inner	0	3	4
2	5-inner	0	5	6
3	0-leaf	1	NULL	NULL
4	2-leaf	1	NULL	NULL
5	4-leaf	2	NULL	NULL
6	6-leaf	2	NULL	NULL
alter table tree add constraint fk_parent foreign key (parent) references tree(id) on update restrict on delete cascade;
alter table tree add constraint fk_left foreign key (left_child) references tree(id) on update restrict on delete cascade;
begin;
delete from tree where value = '5-inner';
select * from tree order by 1;
id	value	parent	left_child	right_child
0	3-root	NULL	1	2
1	1-inner	0	3	4
3	0-leaf	1	NULL	NULL
4	2-leaf	1	NULL	NULL
rollback;
begin;
delete from tree where value = '4-leaf';
select * from tree order by 1;
id	value	parent	left_child	right_child
0	3-root	NULL	1	2
1	1-inner	0	3	4
3	0-leaf	1	NULL	NULL
4	2-leaf	1	NULL	NULL
rollback;
begin;
delete from tree where value = '3-root';
select * from tree order by 1;
id	value	parent	left_child	right_child
commit;
drop table tree;