从“产品”表中查找出单价低于“产品编号”为“431”的记录所对应单价,正确的SQL命令是
A. SELECT*FROM产品WHERE单价<"431"
B. SELECT*FROM产品WHEREEXISTS单价="431"
C. SELECT*FROM产品WHERE单价<(SELECT*FROM产品WHERE单价="431")
D. SELECT*FROM产品WHERE单价<(SELECT单价FROM产品WHERE单价="431")
在“职工”表中有姓名、性别和生日等3个字段,要查询女职工中年龄最小的记录,并显示最小的年龄,正确的SQL命令是
A. SELECTMin(Year(Date())-Year([生日]))AS年龄FROM职工WHERE[性别]="女";
B. SELECTMin(Year(Date())-Year(生日))AS年龄FROM职工WHERE性别=女;
C. SELECT年龄FROM职工WHEREMin(Year(Date())-Year([生日]))AND[性别]="女";
D. SELECT年龄FROM职工WHEREMin(Year(Date())-Year(生日))AND性别=女;