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In a high-level query language such as SQL, queries yield the same result no matter how the logical schema is physically implemented. Nevertheless, a query's cost can vary by orders of magnitude among di erent physical implementations of the same logical schema, even with the most modern query optimizers. Therefore, designing a low-cost physical implementation is an important pragmatic problem|...
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ژورنال
عنوان ژورنال: Information & Management
سال: 1983
ISSN: 0378-7206
DOI: 10.1016/0378-7206(83)90008-3