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Milline on filtrite üldreegel optimeerimisel?
Olgu R ja S kooskõlalised ja
R | S | ||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|
D | E | F |
---|---|---|
1 | 2 | 1 |
A | B | C | D |
---|---|---|---|
1 | 2 | 1 | 2 |
2 | 1 | 2 | 2 |
Millised on andmebaasi juhtimissüsteemi põhitegevused?
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