https://amzn.to/2I3jNgM
Codd’s rules for RDBMS (i) The information rule. (ii) Guaranteed access of data (iii) Systematic treatment of null value. (iv) On line DB support. (v) Comprehensive sup-language rule. (vi) The view update rule. (vii) Insert update rule. (viii) Physical data independence. (ix) Logical data independence. (x) Integrity rule (xi) ...

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