问答题

3.创建修改触发器，该触发器防止用户修改表SC的学生成绩。

答案：要创建一个触发器以防止修改表SC的学生成绩，您需要使用数据库管理系统（如MySQL、SQL Server、Oracle等...

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Assume a year ago the US Treasury yield curve was flat at a rate of 4% per year (with annual compounding) and you bought a 30-year US Treasury bond. Today it is flat at a rate of 5% per year (with annual compounding). What rate of return did you earn on your initial investment, if the bond was a 4% coupon bond with $100 face value?
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