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create table counties ( county varchar(30) not null primary key, country varchar(30) ) engine=ndb; insert into counties values ('Berkshire','England'),('Shropshire','England'), ('Oxfordshire','England'),('Buckinghamshire','England'),('Somewhere','Earth'); create table towns ( town varchar(30) not null primary key, county varchar(30) default "Somewhere", index county_county_index (county), constraint county_town foreign key (county) references counties(county) on delete set default on update restrict ) engine=ndb; insert into towns values ('Maidenhead','Berkshire'),('Reading','Berkshire'), ('Shrewsbury','Shropshire'),('Oxford','Oxfordshire'); delete from counties where county='Shropshire'; ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code) show warnings; Level Code Message Warning 1296 Got error 256 'Foreign key constraint violated: Referenced row exists' from NDB Error 1451 Cannot delete or update a parent row: a foreign key constraint fails (Unknown error code) drop table towns, counties;