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create table parent ( a int primary key auto_increment, b int not null, c int not null, unique(b) using hash, index(c)) engine = ndb; create table child ( a int primary key auto_increment, b int not null, c int not null, unique(b) using hash, index(c)) engine = ndb; create table grandchild ( a int primary key auto_increment, b int not null, c int not null, unique(b) using hash, index(c)) engine = ndb; alter table child add constraint fkname foreign key (a) references parent (a) on delete cascade on update restrict; alter table grandchild add constraint fkname foreign key (a) references child (a) on delete cascade on update restrict; insert into parent values (1,1,1),(2,2,2); insert into child values (1,1,1),(2,2,2); insert into grandchild values (1,1,1),(2,2,2); set ndb_deferred_constraints = 0; begin; delete from parent where a = 1; select * from child order by 1,2,3; a b c 2 2 2 select * from grandchild order by 1,2,3; a b c 2 2 2 rollback; set ndb_deferred_constraints = 1; begin; delete from parent where a = 1; select * from child order by 1,2,3; a b c 1 1 1 2 2 2 select * from grandchild order by 1,2,3; a b c 1 1 1 2 2 2 commit; set ndb_deferred_constraints = 0; select * from child order by 1,2,3; a b c 2 2 2 select * from grandchild order by 1,2,3; a b c 2 2 2 drop table grandchild, child, parent; create table t1 ( a int primary key, b int null, unique(b) using hash) engine = ndb; Warnings: Warning 1121 Ndb does not support unique index on NULL valued attributes, index access with NULL value will become full table scan select max(a) into @maxa from t1; select min(a) into @mina from t1; select count(*) from t1; count(*) 1025 select * from t1 p where not exists (select 1 from t1 c where c.a = p.b); a b 0 NULL alter table t1 add constraint fkname foreign key (b) references t1 (a) on delete cascade on update restrict; set ndb_deferred_constraints = 0; begin; update t1 set b = a + 1; Got one of the listed errors rollback; set ndb_deferred_constraints = 1; begin; update t1 set b = a + 1; commit; ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code) begin; update t1 set b = a + 1; update t1 set b = null where a = @maxa; commit; select count(*) from t1; count(*) 1025 select * from t1 p where not exists (select 1 from t1 c where c.a = p.b); a b 1024 NULL set ndb_deferred_constraints = 0; begin; delete from t1 where a = @maxa - 1; select * from t1; a b 1024 NULL rollback; set ndb_deferred_constraints = 1; begin; delete from t1 where a = @maxa - 5; select count(*) from t1; count(*) 1024 commit; select * from t1 order by 1,2; a b 1020 1021 1021 1022 1022 1023 1023 1024 1024 NULL select * from t1 where b = @maxa; a b 1023 1024 select * from t1 where b = @maxa - 1; a b 1022 1023 select * from t1 where b = @maxa - 2; a b 1021 1022 select * from t1 where b = @maxa - 3; a b 1020 1021 drop table t1;