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Wk12_SQL_4ppB - Mul)pleTables...

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11/15/12 1 Mul)ple Tables Where do you see redundancy? What might an en)ty be? (e.g. lab test) Where do you see redundancy? What might an en)ty be? (e.g. lab test) BANK BRANCH Where do you see redundancy? What might an en)ty be? (e.g. lab test) BANK BRANCH CUSTOMER
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11/15/12 2 Where do you see redundancy? What might an en)ty be? (e.g. lab test) BANK CUSTOMER ACCOUNT En))es Customer: Customers can have more than one account Account: Accounts can be owned by more than one customer; An account is in one branch Branch: Branches can have many accounts Here are tables for each of the three en))es we iden)fied. We have informa-on about: Customers Accounts Branch Is anything missing? Missing Informa)on Rela)ons: Customers have accounts Accounts are located in Branches How do we bring this informa)on into the database? Add branch informa)on to the account table Create a new table that holds account, customer pairs
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11/15/12 3
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