“从学生关系S中检索姓′王′的学生学号”的SQL语句是
A. SELECT sno FROM sc WHERE sname=′王′
B. SELECT sno FROM sc WHERE sname IS LIKE′王%′
C. SELECT sno FROM sc WHERE sname LIKE′王%′
D. SELECT sno FROM sc WHERE sname LIKE′王_′
查看答案
A．It was very developed.B．It was densely populated.C．It was at a war with Great Britai
A. It was very developed.
B. It was densely populated.
C. It was at a war with Great Britain.
D. It was a small, unimportant city.
A．Creativity is an important element of business success.B．Ray Kroc was the close part
A. Creativity is an important element of business success.
B. Ray Kroc was the close partner of the McDonald brothers.
C. Mac and Dick McDonald became broken after they sold their ideas to Ray Kroc.
D. California is the best place to go into business.
从组合线的形状来看，相关系数越大，在不卖空的情况下，证券组合的风险越小，特别是正完全相关的情况下，可获得无风险组合。()
A. 正确
B. 错误
A．How to buy or sell shares.B．Basic knowledge of stock market.C．The stock market is li
A. How to buy or sell shares.
Basic knowledge of stock market.
C. The stock market is like gambling.
D. Investing money in the stock market is not the safest way.
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