ОЦЕНКА ГОРИЗОНТАЛЬНОЙ АГРЕГАЦИИ
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ОЦЕНКА ГОРИЗОНТАЛЬНОЙ АГРЕГАЦИИ С ЧАСТ&#1048

ОЦЕНКА ГОРИЗОНТАЛЬНОЙ АГРЕГАЦИИ С ЧАСТИ


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About the Book

Подготовка набора данных для анализа обычно является наиболее трудоемкой задачей в проекте по добыче данных, требующей множества сложных SQL-запросов, объединения таблиц и агрегирования столбцов. Как правило, для создания наборов данных, где требуется горизонтальная компоновка, требуются значительные ручные усилия. Здесь представлены простые, но мощные методы генерации SQL-кода для возврата агрегированных столбцов в горизонтальной табличной компоновке, возвращая набор чисел вместо одного числа в строке. Этот новый класс функций называется горизонтальными агрегациями. Функция агрегирования с техникой группировки дает оптимизаторам запросов возможность предоставлять различные планы оценки запросов. Для запросов с нераспределительной агрегатной функцией оценка не может быть выполнена, пока не будет построен весь входной поток. Это приводит к задержке всего вычисления. Агрегационные функции такого типа называются целостными агрегационными функциями. Для улучшения производительности оценки целостной функции агрегации можно использовать подход, называемый частичной агрегацией. Частичная агрегация выполняет вычисления инкрементально и увеличивает скорость вычислений.


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Product Details
  • ISBN-13: 9786204113241
  • Publisher: Sciencia Scripts
  • Binding: Paperback
  • Language: Russian
  • Returnable: N
  • Weight: 163 gr
  • ISBN-10: 6204113240
  • Publisher Date: 28 Sep 2021
  • Height: 229 mm
  • No of Pages: 68
  • Spine Width: 4 mm
  • Width: 152 mm


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ОЦЕНКА ГОРИЗОНТАЛЬНОЙ АГРЕГАЦИИ С ЧАСТ&#1048
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