ER-Schema_변환

ER-Schema_변환 - ER to...

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ER to Schemas ER to Schemas R pD ´ . S D e 7 X + 7x + μ * 7 + ÷( p D ´ ( 7x 7 W * p ( W ) ± ± ( ÷ μ ) ± ‡,
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ER ER l 2 R R R R R R R R R R R R R R R R R R R R R R R R n m n 1 1 n
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ª 3 R = { = { = , , , , , , , , , } } = { = { = { , , , { , , , , , , } } = { = { = { , , , { , , , } } = { = { = { , , , } } = { = { = { , , , { , , , , , , } } = { = { = , , , { , , , } }
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} ß ª (1) (1) ¼ ER S * áe q+ 7 ¼ S ´ á eq+ T 7 R = { , } = { , , , } ˆC… ¼ = { , , } ( C… ¼ * ) 4 R R R n 1
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¼ (D ¼ ª (2) (2) (composite attributes) (composite attributes) ± ) ={ , } . , . ( (multi-valued attributes) (multi-valued attributes) ) 1 a d @ b ! ={ , , , , } = { , , , } (D…¼ª* = { , (D…¼ª* } 5
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ÈÒ ª (3) (3) μ
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ER-Schema_변환 - ER to...

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