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Consider an electronic phone book with the following structure For which fields would an index be useful? PHONEBOOK custcode lastname firstname occupation street number city state zipcode telephone 5. Below is a CREATE TABLE command. Explain the function of each part of the command. CREATE TABLE STOCK STKCODE CHAR (3) NOT NULL STKFIRM CHAR (20), STKPRICES DECIMAL (6,2) STKQTY DECIMAL(8) STKDIV DECIMAL (5,2) STKPE DECIMAL (5). NATCODE CHAR (3) PRIMARY KEY (STRCODE) FOREIGN KEY FKNATION (NATCODREFERENCES NATION ON
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