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In an ER diagram, what would be the foreign keys be in the following entitys? INVOICE ( INV _ NUM ( Primary Key ) ,

In an ER diagram, what would be the foreign keys be in the following entitys?

INVOICE $($ INV $_$ NUM $($ Primary Key $),$ PROD $_$ NUM, SALE $_$ DATE, PROD $_$ LABEL $)$

VENDOR $($ VEND $_$ CODE $($ Primary Key $),$ VEND $_$ NAME, QUANT $_$ SOLD, PROD $_$ PRICE $)$

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Question

In an ER diagram, what would be the foreign keys be in the following entitys? INVOICE ( INV _ NUM ( Primary Key ) ,

In an ER diagram, what would be the foreign keys be in the following entitys? INVOICE (INV_NUM (Primary Key), PROD_NUM, SALE_DATE, PROD_LABEL) VENDOR(VEND_CODE (Primary Key), VEND_NAME, QUANT_SOLD, PROD_PRICE)

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Expert Oracle Database Architecture

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In an ER diagram, what would be the foreign keys be in the following entitys?

INVOICE $($ INV $_$ NUM $($ Primary Key $),$ PROD $_$ NUM, SALE $_$ DATE, PROD $_$ LABEL $)$

VENDOR $($ VEND $_$ CODE $($ Primary Key $),$ VEND $_$ NAME, QUANT $_$ SOLD, PROD $_$ PRICE $)$