>After adding a key to a nullable column, null values will
>successfully join through to null values in other tables.
And this is a problem because? :-)
Seriously, it may be a bug, but IMHO it is a design flaw to index a NULL field. Indexed
fields should always be NOT NULL, with the possible exception of FULLTEXT indeces.
But if one DOES have NULLs in an indexed field, I'd fully expect them to match and join
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