Grouping and ordering schemata in competition
نویسندگان
چکیده
منابع مشابه
Avoiding Ordering and Grouping In Query Processing
Sorting and grouping are amongst the most costly operations performed during query evaluation. System R [6] used simple inference strategies to determine orderings held of intermediate relations to avoid unnecessary sorting, and to influence join plan selection. Since then, others have proposed using integrity constraint information to infer orderings of intermediate query results. However, the...
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ژورنال
عنوان ژورنال: Psychonomic Science
سال: 1964
ISSN: 0033-3131,2197-9952
DOI: 10.3758/bf03342818