are necessary. For example, a database might contain a table that has no duplicate drivers’ license numbers. But, a joined or related table might have multiple records related in another table. The relational link makes related records match up to something being searched. The main table would have non-duplicated drivers’ license numbers, but each time a ticket, crash, or other incident is associated with a driver, that information would be in a detail table, linked to the main table by the driver’s…
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