Foreign key primary relationship

Can we create foreign key on composite primary key? how?
Edited by: 854624 on Apr 25, 2011 8:30 PM

Hi,
854624 wrote:
But can we relate one column as foreign key with composite primary key ?Sorry, I don't understand what you're asking. Please post a concrete example, like
"If I have these tables: CREATE TABLE ...
and they contain this data: ...
can I have a foreign key constraint that would allow these statements: INSERT ...
but not allow these: INSERT ...
because ...?"
In the referenced table, the column for a foreign key must be unique. If column_a is unique, then it can be part of a composite primary key, but it doesn't make any sense. if column_a is unique, why isn't column_a, all by itself, the primary key?

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