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J anuar y 12 It began to snow last night. I can't see the village below or the mountain top above. I hope we have en ough food. The puppies -Jigs and Reels-are with me, and they eat more than I do . January 16 Still snowing. The dogs have had nothing to eat since yesterday mor n ing. An hour ago they wante d to go out. They know that things aren't right here. I put them out through a window because I can't ope the door. The snow is two meters deep outside. January 17 Jigs and Reels didn't come back last night. "Dead, "I thought. They ’ re only five months old. This weather kills. But at mid-morning I heard them calling me. I looked out and could not believe-they were dragging a big rabbit through the snow. They dropped him through the window into my hands. Rabbit for dinner. January 18 Still snowing and the wind are strong. Jigs and Reels have been out again. What do you think they brought back? Two gray pigeons! I finished my own food on the 16th-so how glad I am! January 20 Better weather today, but the sky is still dark. There meters of snow outside. Reels killed anoth er rabbit,near the house. I watched how he did it. Then he and Jigs brought it proudly ho me.
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B.
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每个数据库表可以建立多个聚集索引
B.
每个表可以定义多个非聚集索引
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索引的数据保存在同一个表中
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