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【单选题】
1000个学生,10000个选课记录。2号课程选课记录50个。一块内存可以放10个学生或者100个选课记录。计算机的内存有限,只能同时放下5块学生、1块选课记录和若干连接结果。计算机每秒可读写20块。问若先做学生和选课记录的笛卡儿积运算,至少需要读取()遍选课记录表?A.
1
B.
20
C.
100
D.
以上说法都不对
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