MySQLではデータベースの一貫性を保つため、外部キー（Foreign Key）制約がサポートされています。

Properly expressing foreign keys (which means understanding the possible semantic subtleties involved in various alternatives), singles out mastery of the data modeling process. And truly ...

I'm adding a table and subclass table to my DB. (Subclass table = table where the primary key joins to the primary key of another table, to give extra row information to some subset of the rows ...

For Higher Computing Science, revise the use of primary and foreign keys and the difference between flat file and relational databases.

Foreign key 'geneassay_fk' references invalid column 'geneassay' in referencing table 'b_SequencingData_seq'. Msg 1750, Level 16, State 0, Line 43 Could not create constraint.

For everyone normalizing their designs, just remember: There ain't no such thing as a partial foreign key. When a project pretends that partial foreign keys are a valid concept, the end result is a ...