[GENERAL] Foreign keys

[Neal Lindsay]

If I create a columnA in a tableA that "REFERENCES tableB(columnB)" in 
another table, where column B is not null, does that imply a "NOT NULL" on 
my columnA?  In other words, does it ensure that the value of A is in the 
set of values for B, or that the value of A is in the Bs unless A is null?

Thanks,
Neal Lindsay


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