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Выгрузка из одной IT в другую с отбором



 
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damluar
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PostPosted: Wed Jul 02, 2008 11:53 am    Post subject: Выгрузка из одной IT в другую с отбором Reply with quote
Всем привет. Столкнулся с такой проблемой: нужно из одной внутр. таблицы выгрузить данные в другую с отбором по некоторым полям.
Стандартный READ может выгружать только в work area, а если делать LOOP по таблице то это слишком медленно работает.
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vga
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PostPosted: Wed Jul 02, 2008 1:42 pm    Post subject: Reply with quote
Если разместить нужные поля первой таблицы первыми, то отработает такое копирование.
it_dest[] = it_scr[].

Возможно, если вы в LOOP делаете INSERT, замените его на APPEND.
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damluar
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PostPosted: Wed Jul 02, 2008 2:18 pm    Post subject: Reply with quote
меня интересует не проекция, а выборка.
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vga
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PostPosted: Wed Jul 02, 2008 2:33 pm    Post subject: Reply with quote
Если loop работает медленно, объявите внутреннюю таблицу как sorted по полям, используемым в условии where.

Quote:
Notes
When you use the WHERE condition with a STANDARD or HASHED table, a full table scan is always required.
If you are working with a SORTED TABLE, the partial sequential processing can be optimized so that only the entries that actually satisfy the WHERE condition are processed. This optimization requires that the WHERE condition be specified in the form

WHERE k1 = v1 AND k2 = v2 AND ... AND kn = vn

where the components k1, ..., kn are in the same sequence as the beginning of the table key.
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mike1
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PostPosted: Thu Jul 03, 2008 11:07 am    Post subject: Reply with quote
В курсе bc401 приведен пример алгорима по работе со стандартной таблицей.
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