45 lines
2.3 KiB
Plaintext
45 lines
2.3 KiB
Plaintext
create table parent (
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a int primary key,
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b int not null,
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c int not null,
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unique(b) using hash,
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index(c)) engine = ndb;
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create table child (
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a int primary key,
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b int not null,
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c int not null,
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unique(b) using hash,
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index(c)) engine = ndb;
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insert into parent values (1,2,3);
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insert into child values (3,4,5);
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alter table child algorithm=inplace, add constraint fkname foreign key (a) references parent(a);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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alter table child algorithm=inplace, add constraint fkname foreign key(b) references parent(a);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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alter table child algorithm=inplace, add constraint fkname foreign key(c) references parent(a);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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alter table child algorithm=inplace, add constraint fkname foreign key(a) references parent(b);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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alter table child algorithm=inplace, add constraint fkname foreign key(b) references parent(b);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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alter table child algorithm=inplace, add constraint fkname foreign key(c) references parent(b);
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ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (Unknown error code)
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insert into parent values (2,3,4);
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insert into parent values (3,4,5);
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insert into parent values (4,5,6);
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insert into parent values (5,6,7);
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alter table child algorithm=inplace, add constraint fk1 foreign key(a) references parent(a);
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alter table child algorithm=inplace, add constraint fk2 foreign key(b) references parent(a);
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alter table child algorithm=inplace, add constraint fk3 foreign key(c) references parent(a);
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alter table child algorithm=inplace, add constraint fk4 foreign key(a) references parent(b);
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alter table child algorithm=inplace, add constraint fk5 foreign key(b) references parent(b);
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alter table child algorithm=inplace, add constraint fk6 foreign key(c) references parent(b);
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alter table child algorithm=inplace,
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drop foreign key fk1,
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drop foreign key fk2,
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drop foreign key fk3,
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drop foreign key fk4,
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drop foreign key fk5,
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drop foreign key fk6;
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drop table parent, child;
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