| 31. | The primary keys within a database are used to define the relationships among the tables.
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| 32. | Therefore, most physical implementations have a unique primary key ( PK ) for each table.
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| 33. | Primary keys were added to the SQL standard mainly as a convenience to the application programmer.
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| 34. | The primary key in the first may be associated with multiple primary keys in the second.
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| 35. | The primary key in the first may be associated with multiple primary keys in the second.
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| 36. | Consider a database where each operation begins with a lookup of a record s primary key.
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| 37. | Other types of constraints ( unique, primary key, and foreign key constraints ) are not inherited.
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| 38. | The primary key to success in a kiosk or RMU is low SKUs and higher transaction totals.
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| 39. | In a row-oriented indexed system, the primary key is the rowid that is mapped to indexed data.
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| 40. | Secondary indexes have primary keys at their leaves to logically link to the record in the primary index.
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