ch07 - 7 데데데 데데데데 데데데 2(relational...

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Unformatted text preview: 7. 데데데 데데데데 데데데 2 (relational scheme) (relational scheme) 데데 데데데 데데데데 데데데 데데데데 데데데 데데데 데데데 ? i. 데데데데데 , 데데데 , 데데데데 데데 ⅱ . 데데데 데데데데데데데 데데데데데데 데데 데데데 데데데 : 데데데데데데데데 데데데 데데데데 데데데 데데 데데데데 데데데 iii. 데데데 데데데 데데 데데 (anomaly) 3 데데데 : 데데 , 데데 데데 데데 데데데데 데데 데데 100 C413 A 4 100 E412 A 4 200 C123 B 3 300 C312 A 1 300 C324 C 1 300 C413 A 1 400 C312 A 4 400 C324 A 4 400 C413 B 4 400 E412 C 4 500 C312 B 2 ▶ (anomaly) example : example : 4 ▶ (2) (deletion anomaly) (deletion anomaly) 200 데 데데데 'C123' 데 데데데 데데 ⇒ 3 데데데데데 데데데 데데 데데데 데데 데데 (triggered deletion) 데 데데 데데데 데데 (loss of information) (insertion anomaly) (insertion anomaly) 600 데 데데데 2 데데데데데 데데데 데데 ⇒ 데데 데데데 데데데데 데데 데 데데데 데데데 ( ∵ 데데 데데데 데데 데 ) 데데데 데데 데데데 데데 데데 (update anomaly) (update anomaly) 400 데 데데데 데데데 4 데데 3 데데 데데 ⇒ 데데데 400 데 4 데데 데데 데데데 데데데데데 데 데데데데데데 데데 데데데데 데데데 데데데 (inconsistency) 데데 5 ▶ 데데데데데데 데데 데데데데 데데 데데데데데 데데데 데데데데데 데데 데데데데데데 데데 데데데데데 데데데데 데데데데 데데데데데데 데데 (decomposition) ⇒ 데데데 (normalization) 6 ▶ : : ① 데데데데데데데 데데데 데데 데데 ( 데데데 ) 데데 데데 ② 데데데 데데데 데데데 데데 데데데 데데 데데 데데 데데데데데데 데데 ⇒ 데데데 데데 (schema transformation) ① 데데데 데데데 ② 데데데데 데데데 데데 ③ 데데데 데데 7 (FD) 데데 데데데데 R 데데 , 데데데데데 X 데 데 데데데 데데 데데데데데 Y 데 데데 데데데 데 데 데 데데데데데 Y 데 데데데데데 X 데 데데 데데 X 데 Y 데데데데데 X 데 Y 데 ( 데데데데데 ) 데데 X 데 데데데 (determinant) Y 데 데데데 (dependent) X, Y 데 데데 데데데데데데 데 데데 8 (2) ☞ ☞ Note Note 데데데데 R 데데...
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ch07 - 7 데데데 데데데데 데데데 2(relational...

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