Warning 150 Alter table '`test`.`t2`' with foreign key constraint failed. There is no index in the referenced table where the referenced columns appear as the first columns near ' foreign key (b) references t2(b)'.
Warning 150 Alter table `test`.`t1` with foreign key constraint failed. Referenced table `test`.`t11` not found in the data dictionary near ' foreign key (f1) references t11(f1)'.
Warning 150 Alter table `mysqld.1`.`t1` with foreign key constraint failed. Referenced table `mysqld.1`.`t1` not found in the data dictionary near 'foreign key(b) references t1(a)'.
Warning 1215 Cannot add foreign key constraint for `t1`
drop table t1;
create table t1(a int not null primary key, b int, key(b)) engine=innodb;
alter table t1 add foreign key(a,b) references t1(a);
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@@ -106,7 +106,7 @@ show warnings;
Level Code Message
Warning 150 Alter table `test`.`t1` with foreign key constraint failed. You have defined a SET NULL condition but column 'f1' is defined as NOT NULL in ' foreign key (f1) references t1(f1) on update set null' near ' on update set null'.
Warning 150 Alter table `test`.`t2` with foreign key constraint failed. Referenced table `test`.`t3` not found in the data dictionary near ' FOREIGN KEY (f3) REFERENCES t3 (id) ON DELETE CASCADE'.
Warning 150 Alter table '`test`.`child`' with foreign key constraint failed. There is no index in the referenced table where the referenced columns appear as the first columns near 'FOREIGN KEY(p) REFERENCES parent(p)'.
Warning 1215 Cannot add foreign key constraint for `child`
ALTER TABLE parent DROP INDEX idx1;
ALTER TABLE child ADD FOREIGN KEY(p) REFERENCES parent(p);
Got one of the listed errors
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@@ -1534,7 +1534,7 @@ show warnings;
Level Code Message
Warning 150 Alter table '`test`.`child`' with foreign key constraint failed. There is no index in the referenced table where the referenced columns appear as the first columns near 'FOREIGN KEY(p) REFERENCES parent(p)'.
Warning 1215 Cannot add foreign key constraint for `child`
ALTER TABLE child DROP INDEX idx2;
ALTER TABLE child ADD FOREIGN KEY(p) REFERENCES parent(p);
Got one of the listed errors
...
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@@ -1542,7 +1542,7 @@ show warnings;
Level Code Message
Warning 150 Alter table '`test`.`child`' with foreign key constraint failed. There is only prefix index in the referenced table where the referenced columns appear as the first columns near 'FOREIGN KEY(p) REFERENCES parent(p)'.