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Docs/manual.texi:
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@ -38065,7 +38065,7 @@ foreign key constraint to a table through
ALTER TABLE yourtablename ADD CONSTRAINT FOREIGN KEY (...) REFERENCES anothertablename(...)
@end example
Remember to create the required indexes first, though.
Starting from version 3.23.50, InnoDB does not check foreign key
constraints on those foreign key or referenced key values
which contain a NULL column.