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用SQL语句完成下列各题: 设某商业集团关于商店销售商品的数据库中有三个基本表: 商店关系:SHOP(SNO,SNAME,AREA,MGRNAME) 其属性分别表示商店编号,商店名称,区域名,经理姓名。 商品关系:GOODS(GNO,GNAME,PRICE) 其属性分别表示商品编号,商品名称,单价。 销售关系:SALE(SNO,GNO,QUANTITY) 其属性分别表示商店编号,商品编号,销售数量。 1、建立商品表:GOODS(GNO,GNAME,PRICE),其中GNO、GNAME均为字符型,长度分别为3和20,GNAME值非空且唯一,PRICE为整型。GNO为主码,PRICE范围为0-8000,包括边界值。 2、查询区域名为“WEST”的所有的商店的名称和经理姓名。 3、查询销售商品名称为“冰箱”的商店的编号和商店名称。 4、从SALE表中,把“开心商店”中销售的全部删除。 5、统计每个区域的所有商店的个数。要求查询的目标列为区域名和商店个数(不起别名)。 6、在GOODS表中插入商店编号为'16',商店名称为’净水器’, 单价为3000的。 7、把SHOP表中商店编号为'A01'的经理姓名改为'明'。
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【单选题】We see that the Netherlands, Belgium, and Ireland trade considerably more with the United States than with many other countries.
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This is explained by the gravity model, since these are all large countries.
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This fails to be consistent with the gravity model, since these are large countries.
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This is explained by the gravity model, since they do not share borders.
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