表达式type（{}）==set的值为（）。
表达式type（{}）==set的值为（）。
相关考题：
在oracle数据库中,如何删除sales表中产品类型为toys的profits列的列值?() A.delete from sales;B.delete profits from sales where product_type=’TOYS’;C.delete from sales where product_type=’ToYS’;D.update sales set profits=null where product_type=’TOYS’;
Refer to the exhibit. A company would prefer all Internet - bound OSPF routed traffic to use ISP ABC with ISP DEF as a backup. As the network consultant, what three configuration changes might you make?（）A. The default -information originate command should be configured on router B1 and B4.B. The default -information originate command should be configured on router B2 and B3.C. If the metric value for ISP ABC is set at the default, the I SP DEF metric value should be set to 1.D. If the metric value for ISP ABC is set at the default, the ISP DEF metric value should be set to 25.E. The metric type value should be set to type 1.F. The metric type value should be set to type 2.
假设ClassX是类类型标识符，Type为类型标识符，可以是基本类型或类类型，Type_Value为Type类型的表达式，那么，类型转换函数的形式为（）A、ClassX：：operator Type（Type t）{… return Type_Value；}B、friendClassX：：operator Type（）{… return Type_Value；}C、Type ClassX：：operator Type（）{…return Type_Value；}D、ClassX：：operator Type（）{… return Type_Value；}
在oracle数据库中，如何删除sales表中产品类型为toys的profits列的列值？（）A、delete from salesB、delete profits from sales where product_type=’TOYS’C、delete from sales where product_type=’ToYS’D、update sales set profits=null where product_type=’TOYS’
单选题假设ClassX是类类型标识符，Type为类型标识符，可以是基本类型或类类型，Type_Value为Type类型的表达式，那么，类型转换函数的形式为（）AClassX：：operator Type（Type t）{… return Type_Value；}BfriendClassX：：operator Type（）{… return Type_Value；}CType ClassX：：operator Type（）{…return Type_Value；}DClassX：：operator Type（）{… return Type_Value；}