I have an integer column that is not needed for some rows in the table
(whether it is necessary is a factor of other row attributes, and it isn't worth putting in a separate table).

What are the performance tradeoffs (storage space, query speed) of using NULL versus a sentinel integer value?

Not that it matters, but in the event where the column values matter,
the numberic value is a foreign key.  Advice on that welcome too.


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