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Andmebaasid (LTAT.03.004)

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Olgu relatsioon R seisundiga

A	B	C	D
1	2	1	2
2	1	2	2

σ_α(R) = {<1, 2, 1, 2> } kui α = (A >= 1, B <= 2, C >= 1, D = 2)

σ_α(R) = {<1, 2, 1, 2>} kui α = (A = 1 & B <= 0 & C <= 1)

σ_α(R) = {<1, 2, 1, 2>} kui α = (A >= 1 & B = 2 & C <= 1)

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Millised on andmebaasi juhtimissüsteemi põhitegevused?

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