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.

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 ...

Retaining an infinitude of Foreign Keys may cause future performance bottlenecks as transactional volume will get a performance hit by maintaining all those foreign keys and the indexes behind them.

For National 5 Computing Science, revise the use of primary and foreign keys and the difference between flat file and relational databases.