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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; alter table child add constraint fkname foreign key (a) references parent(a) on delete restrict on update restrict; insert into parent values (1,1,1); insert into child values (1,1,1); insert into child values (2,2,2); ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code) # Disabling foreign key checks set foreign_key_checks = 0; insert into child values (2,2,2); select * from child order by 1,2,3; a b c 1 1 1 2 2 2 set foreign_key_checks = 1; begin; delete from parent; ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code) rollback; # Disabling foreign key checks set foreign_key_checks = 0; begin; delete from parent; rollback; delete from child; delete from parent; set foreign_key_checks = 1; begin; insert into child values (2,2,2); ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code) rollback; # Disabling foreign key checks set foreign_key_checks = 0; begin; insert into child values (2,2,2); rollback; set foreign_key_checks = 1; delete from child; delete from parent; insert into parent values (1,1,1); begin; insert into child values (1,1,1); begin; delete from parent; ERROR HY000: Lock wait timeout exceeded; try restarting transaction commit; commit; delete from child; delete from parent; # Disabling foreign key checks set foreign_key_checks = 0; insert into parent values (1,1,1); # Disabling foreign key checks set foreign_key_checks = 0; begin; insert into child values (1,1,1); # Disabling foreign key checks set foreign_key_checks = 0; begin; delete from parent; commit; set foreign_key_checks = 1; commit; set foreign_key_checks = 1; select * from parent order by 1,2,3; a b c select * from child order by 1,2,3; a b c 1 1 1 delete from child; delete from parent; set foreign_key_checks = 0; insert into parent values (1,1,1); insert into parent values (1,1,1); ERROR 23000: Duplicate entry '1' for key 'PRIMARY' insert into parent values (2,1,1); ERROR 23000: Duplicate entry '1' for key 'b' delete from child; delete from parent; insert into parent values (1,1,1); insert into child values (1,1,1); set ndb_deferred_constraints = 1; set foreign_key_checks = 1; set foreign_key_checks = 0; begin; set foreign_key_checks = 1; insert into child values (2,2,2); commit; ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code) begin; insert into child values (2,2,2); set foreign_key_checks = 0; commit; ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code) begin; insert into child values (2,2,2); set foreign_key_checks = 1; commit; begin; insert into child values (3,3,3); insert into child values (4,4,4); set foreign_key_checks = 0; insert into parent values (3,3,3); commit; ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code) set foreign_key_checks = 1; begin; insert into child values (3,3,3); set foreign_key_checks = 0; insert into parent values (3,3,3); insert into child values (4,4,4); commit; set foreign_key_checks = 1; set ndb_deferred_constraints = 0; alter table child drop foreign key fkname; delete from child; delete from parent; alter table child add constraint fkname foreign key (a) references parent(a) on delete no action on update no action; insert into parent values (1,1,1); insert into child values (1,1,1); insert into child values (2,2,2); ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code) insert into parent values (2,2,2); insert into child values (2,2,2); begin; update parent set a = a + 2; commit; ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code) select * from parent order by 1,2,3; a b c 1 1 1 2 2 2 select * from child order by 1,2,3; a b c 1 1 1 2 2 2 # Disabling foreign key checks set foreign_key_checks = 0; insert into child values (3,3,3); insert into parent values (3,3,3); begin; update parent set a = a + 3; commit; select * from parent order by 1,2,3; a b c 4 1 1 5 2 2 6 3 3 select * from child order by 1,2,3; a b c 1 1 1 2 2 2 3 3 3 set foreign_key_checks = 1; alter table child drop foreign key fkname; delete from child; delete from parent; alter table child add constraint fkname foreign key (a) references parent (a) on delete cascade on update restrict; 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 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); 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 commit; # Disabling foreign key checks set foreign_key_checks = 0; begin; delete from parent where a = 2; 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 commit; set foreign_key_checks = 1; alter table child drop foreign key fkname; alter table grandchild drop foreign key fkname; delete from grandchild; delete from child; delete from parent; alter table child add constraint fkname foreign key (b) references parent(b) on delete restrict on update cascade; alter table grandchild add constraint fkname foreign key (b) references child(b) on delete restrict on update cascade; 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); begin; update parent set b = 3 where a = 1; select * from child order by 1,2,3; a b c 1 3 1 2 2 2 select * from grandchild order by 1,2,3; a b c 1 3 1 2 2 2 rollback; # Disabling foreign key checks set foreign_key_checks = 0; begin; update parent set b = 3 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 rollback; set foreign_key_checks = 1; alter table child drop foreign key fkname; alter table grandchild drop foreign key fkname; delete from grandchild; delete from child; delete from parent; 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; set ndb_deferred_constraints = 1; 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); begin; # Disabling foreign key checks set foreign_key_checks = 0; 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; 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 delete from grandchild; delete from child; delete from parent; 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 foreign_key_checks = 1; begin; delete from parent where a = 1; # Disabling foreign key checks set foreign_key_checks = 0; 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; 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 set ndb_deferred_constraints = 0; set foreign_key_checks = 1; alter table child drop foreign key fkname; alter table grandchild drop foreign key fkname; delete from grandchild; delete from child; delete from parent; alter table child add constraint fkname foreign key (b) references parent(b) on delete restrict on update cascade; alter table grandchild add constraint fkname foreign key (b) references child(b) on delete restrict on update cascade; set ndb_deferred_constraints = 1; 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); begin; # Disabling foreign key checks set foreign_key_checks = 0; update parent set b = 3 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; 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 delete from grandchild; delete from child; delete from parent; 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 foreign_key_checks = 1; begin; update parent set b = 3 where a = 1; # Disabling foreign key checks set foreign_key_checks = 0; 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; select * from child order by 1,2,3; a b c 1 3 1 2 2 2 select * from grandchild order by 1,2,3; a b c 1 3 1 2 2 2 set ndb_deferred_constraints = 0; set foreign_key_checks = 1; alter table child drop foreign key fkname; alter table grandchild drop foreign key fkname; delete from grandchild; delete from child; delete from parent; drop table parent, child, grandchild; set @save_ndb_join_pushdown = @@session.ndb_join_pushdown; set ndb_join_pushdown = true; create table t1 ( a int not null, b int not null, c int, d int not null, primary key (a), unique (b), unique (c), unique (d) ) engine=ndb; create table t2 ( a int not null, b int not null, c int, d int, primary key (a) ) engine=ndb; alter table t2 add constraint fa foreign key (a) references t1 (a) on delete cascade on update restrict; alter table t2 add constraint fb foreign key (b) references t1 (b) on delete cascade on update restrict; alter table t2 add constraint fc foreign key (c) references t1 (c) on delete cascade on update restrict; alter table t2 add constraint fd foreign key (d) references t1 (d) on delete cascade on update restrict; insert into t1 values (1,1,1,1), (2,2,2,2), (3,3,3,3), (4,4,4,4), (5,5,5,5), (6,6,6,6); insert into t2 values (1,1,1,1), (2,2,2,2), (3,3,3,3), (4,4,4,4), (5,5,5,5), (6,6,6,6); update t1 set b = 17 where c > 5; ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code) update t1 set c = null where c = 2; ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code) select * from t1,t2 where t2.a = t1.b and t2.b = t1.c; a b c d a b c d 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 6 6 6 6 6 6 6 6 delete from t1 where d = 3; select * from t2 order by a; a b c d 1 1 1 1 2 2 2 2 4 4 4 4 5 5 5 5 6 6 6 6 select * from t1,t2 where t2.a = t1.b + 1; a b c d a b c d 1 1 1 1 2 2 2 2 4 4 4 4 5 5 5 5 5 5 5 5 6 6 6 6 insert into t1 values (3,3,3,3); insert into t2 values (3,3,3,3); # Disabling foreign key checks set foreign_key_checks = 0; update t1 set b = 17 where c > 5; update t1 set c = null where c = 2; select * from t1,t2 where t2.a = t1.b and t2.b = t1.c; a b c d a b c d 1 1 1 1 1 1 1 1 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 select * from t2 order by a; a b c d 1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4 5 5 5 5 6 6 6 6 delete from t1 where d = 3; select * from t2 order by a; a b c d 1 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4 5 5 5 5 6 6 6 6 select * from t1,t2 where t2.a = t1.b + 1; a b c d a b c d 1 1 1 1 2 2 2 2 2 2 NULL 2 3 3 3 3 4 4 4 4 5 5 5 5 5 5 5 5 6 6 6 6 drop table t2, t1; set ndb_join_pushdown = @save_ndb_join_pushdown; set foreign_key_checks = 1;