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Reduced record retrieval time. When you're looking for records, you don't search through each one yourself to find the ones containing the information you want. Suppose you work in a dentist's office. If you want to send out reminders to all patients who haven't been in for their checkup in a while, you ask the filing system to find the appropriate records for you. Of course, you do this differently than if you were talking to another person to whom you'd say, "Please determine which patients haven't visited within the last 6 months." With a database, you utter a strange incantation:
SELECT last_name, first_name, last_visit FROM patient
WHERE last_visit < DATE_SUB(CURDATE(),INTERVAL 6 MONTH);
That can be pretty intimidating if you've never seen anything like it before, but the prospect of getting results in a second or two rather than spending an hour shuffling through your records should be attractive. (In any case, you needn't worry. That odd-looking bit of gobbledygook won't look strange for long. In fact, you'll understand exactly what it means by the time you've finished this chapter.)
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