Re^5: OO concepts and relational databases

However I will not allow it to be said RDBMS do not support ISA relationships, when they are clearly supported and the relationship follows directly from normalization.

Wrong. That is completely and utterly wrong. RDBMSes support HAS-A relationships, in that a lineitem record HAS-A invoice record that it is on. Set theory (which RDBMSes are based on) is all about HAS-A relationships. The only IS-A relationship is the relationship between the specific record and the table it lives in. The person you are attempting to lay the smack-down is absolutely correct.

You might do well to rethink exactly what an IS-A relationship is vs. a HAS-A relationship and how normalization works with that.

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Comment on Re^5: OO concepts and relational databases

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Re^6: OO concepts and relational databases by Solo (Deacon) on Aug 03, 2004 at 12:22 UTC
I think we are not using the word 'supports' in the same manner. Allow me to clarify my definition with a contextual example. RDBMS support ISA relationships like Perl 5 supports OO programming. --Solo -- You said you wanted to be around when I made a mistake; well, this could be it, sweetheart.	[reply]


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