Missing Values in a Relational Data Base
Missing Values in a Relational Data Base
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In our eReader you can find the full English version of the book. Read Missing Values in a Relational Data Base Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Missing Values in a Relational Data Base
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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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To quickly assess the difficulty of the text, read a short excerpt:
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 ^ "^^, .
What to read after Missing Values in a Relational Data Base?
You can find similar books in the "Read Also" column, or choose other free books by Nicolau Reinhard to read online
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