Titlebook: Database Design and Relational Theory; Normal Forms and All C. J. Date Book 2019Latest edition C. J. Date 2019 Database Design.Functional D

abolish

Isometric

上下連貫

摘要

Foreknowledge

Denormalization, not in detail). But denormalization, if it means anything at all, can’t apply just to BCNF specifically; I mean, it can’t refer just to dropping back to some level of normalization that’s lower than BCNF specifically. Rather, it has to mean dropping back from . given level of normalization to some

緩和

JDs and 5NF (Informal)s); as noted in Chapter ., in fact, 5NF is . normal form with respect to JDs, just as BCNF is . normal form with respect to FDs. And the treatment of these ideas in this part of the book therefore parallels the treatment of BCNF and FDs in Part II. In other words, I plan to treat the material both f

arterioles

JDs and 5NF (Formal)ment of material introduced informally in Chapter .. But there’s rather more to cover in this chapter than there was in Chapter ., as you’ll soon see. Let me just say up front that, just as Chapter . had little to say about 2NF or 3NF, so this chapter has little to say about 4NF, either; like 2NF an