对于基于启发式规则中的选择操作,一旦处理的关系较小,即使选择列上建有索引,也使用全表顺序扫描。( )
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A. The size of the room
B. Long working hours
C. The hot weather
D. The air conditioner in the room
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A. Some vegetables
B. some meat
C. Their different eating habits
D. The health problems
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A. The kitchen of a restaurant.
B. Dinning room at home.
C. A wine cellar.
D. A steakhouse.
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A poor chef.
B. A delicious dish.
C. The woman's mother.
D. The man's mother.