An index with many key columns is called a wideindex.
具有许多键列的索引称为宽索引。
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A wideindex is frequently associated with a large key length.
宽索引的键长度通常较大。
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Other health benefits packed into berries: They're rich in a wide variety of antioxidants, low in calories, and even have a low glycemic index (shown to better maintain steady blood sugar levels).