我国四大工业基地均位于东部沿海地区,对其原因分析不正确的是[ ]
A.交通便利
B.人口稠密
C.工业基础好
D.海边风光好
答案:D
以下是PRODUCT表和SHIPPING COST表的结构: PRODUCT --------------------------------- PRODUCT_ID NUMBER(9) PRODUCT_NAMEVARCHAR2(20) COSTNUMBER(5, 2) RETAIL_PRICENUMBER(5, 2) WEIGHT NUMBER(5, 2) SHIPPING_COST --------------------------------- ID NUMBER(9) LOWWEIGHT NUMBER(5, 2) HIGHWEIGHT NUMBER(5, 2) COSTNUMBER(5, 2) 如果需要显示包括了每个产品运输价格(shipping cost)的产品名(product name),而运输价格是通过比较SHIPPING COST表中产品重量的下限和上限来计算的。现在请问,应使用如下查询语句中的哪两个语句
A.SELECT product_name, cost FROM product NATURAL JOIN shipping_cost;B.SELECT p.product_name, s.cost FROM product p, shipping_cost s WHERE p.product_id=s.id(+);C.SELECT p.product_name, s.cost FROM product p, shipping_cost s WHERE p.weight BETWEEN s.lowweight AND s.highweight;D.SELECT p.product_name, s.cost FROM product p, shipping_cost s USING (p.weight, BETWEEN s.lowweight AND s.highweight);E.SELECT p.product name.s.cost FROM product p JOIN shipping_cost s ON (p.weight BETWEEN s.lowweight AND s.highweight);
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