【单选题】
假定已经定义了一个名为arr_type的PL/SQL表类型，那么怎样实例化一个arr_type类型的变量（）
A、v_arr arr_type;
B、v_arr is arr_type;
C、v_arr of arr_type;
D、v_arr arr_type%type;
查看正确答案
A、A.type array arr_type[emp.ename%type] index by binary_integer; B、B.type table arr_type[emp.ename%type] index by binary_integer; C、C.type arr_type is table of emp.ename%type index by binary_integer; D、D.type arr_type is pl_sql table of emp.ename%type index by binary_integer;
