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-- source include/have_ndb.inc 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, c int, unique(b) using hash, index(c)) engine = ndb; ### ### PK vs UK ### alter table child add constraint fkname foreign key (b) references parent (a) on update restrict on delete set null; insert into parent values (1,1,1),(2,2,2); insert into child values (1,1,1),(2,2,2); --error 1452 insert into child values (3,3,3); --error 1452 update child set b = 3 where a = 1; begin; delete from parent where a = 1; select * from child order by 1,2,3; commit; delete from child; delete from parent; alter table child drop foreign key fkname; ### ### PK vs OI ### alter table child add constraint fkname foreign key (c) references parent (a) on update restrict on delete set null; insert into parent values (1,1,1),(2,2,2); insert into child values (1,1,1),(2,2,2),(3,3,1); --error 1452 update child set c = 3 where a = 1; --error 1452 insert into child values (4,4,4); begin; delete from parent where a = 1; select * from child order by 1,2,3; commit; delete from child; delete from parent; alter table child drop foreign key fkname; ### ### UK vs UK ### alter table child add constraint fkname foreign key (b) references parent (b) on update set null on delete set null; insert into parent values (1,1,1),(2,2,2); insert into child values (1,1,1),(2,2,2); --error 1452 update child set b = 3 where a = 1; --error 1452 insert into child values (3,3,3); begin; update parent set b = 3 where a = 1; select * from child order by 1,2,3; rollback; begin; delete from parent where a = 1; select * from child order by 1,2,3; commit; delete from child; delete from parent; alter table child drop foreign key fkname; ### ### UK vs OI ### alter table child add constraint fkname foreign key (c) references parent (b) on update set null on delete set null; insert into parent values (1,1,1),(2,2,2); insert into child values (1,1,1),(2,2,2),(3,3,1); --error 1452 update child set c = 3 where a = 1; --error 1452 insert into child values (4,4,4); begin; update parent set b = 3 where a = 1; select * from child order by 1,2,3; rollback; begin; delete from parent where a = 1; select * from child order by 1,2,3; commit; delete from child; delete from parent; alter table child drop foreign key fkname; drop table parent, child;