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Alex Rivera
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If I have a table with columns A, B, C, D A: auto-generated id (PK) B & C: combination must be unique (these are the columns that actually define identity in the business sense) D: some other columns Now, if I'll create business objects based on this table (e.g. in Java), which one would be a better implementation of the equals() method: define equality based on A define equality based on B and C or, it wouldn't really matter which of the two I choose.
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