Missing Values in a Relational Data Base

Cover Missing Values in a Relational Data Base
Missing Values in a Relational Data Base
Nicolau Reinhard
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In fact ^ = Nmax/«min= ^. NV (n^ + D < 2 -20- 5. 2 Degradation due to the application of the extended relational algebra operations Consider relations A and B having respectively K and K missing values, m and itl tuples in the maybe part, and n. And n^ tuples in both the certain and maybe parts. 5. 2. 1. Union C = AUB According to the definition of union in 4. 2. 1 N^ ^ N^ . N3 and K^ = K^ + K3 5. 2. 2. Intersection C = AHB Given tuples t. F A, t^ f B, according to 4. 2. 2. tj. /^ t„ generates the samples t. And (p if t. = tg and t^ is in the maybe part of A, or if t. Contains no missing values, tn has missing values and t, is a sample of tg. Since there are no duplicate tuples in A, relation A can have at most n such tuples for each tuple of B with i missing values. The same reasoning can be applied to the tuples of B. Therefore ^"»A ^ "^^, .

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