Издательство: | Книга по требованию |
Дата выхода: | июль 2011 |
ISBN: | 978-6-1333-5295-7 |
Объём: | 68 страниц |
Масса: | 123 г |
Размеры(В x Ш x Т), см: | 23 x 16 x 1 |
High Quality Content by WIKIPEDIA articles! In databases, a partial index, also known as filtered index is an index which has some condition applied to it so that it includes a subset of rows in the table.This allows the index to remain small, even though the table may be rather large, and have extreme selectivity.Suppose you have a transaction table where entries start out with STATUS = 'A' (active), and then may pass through other statuses ('P' for pending, 'W' for "being worked on") before reaching a final status, 'F', at which point it is no longer likely to be processed again.
Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.