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【简答题】
如果为下列预编译SQL的第三个问号赋值，那么不正确的选项是（ ）UPDATE emp SET ename=?,job=?,salary=? WHERE empno=? A. pst.setInt("3",2000); B. pst.setInt(3,2000); C. pst.setFloat("salary",2000); D. pst.setString("salary","2000");
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举一反三
【单选题】Employers often complain about Generation-X because______.
A.
these young people will not accept their leadership
B.
they don't understand their employees' job
C.
managing this group of people is no easy job
D.
they don't know how to manage and help this group of people
【简答题】删除外键约束的语法格式是【】。