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单项选择题
A.type array arr_type[emp.ename%type] index by binary_integer;
B.type table arr_type[emp.ename%type] index by binary_integer;
C.type arr_type is table of emp.ename%type index by binary_integer;
D.type arr_type is pl_sql table of emp.ename%type index by binary_integer;
单项选择题
A.NO DATA FOUND
B.DATA_NOT_FOUND
C.NO_DATA_FOUND
D.DATA_NO_FOUND
单项选择题
A.v_namechar(60);
B.v_namestring(60);
C.v_namevarchar2(60);
D.v_namevarchar2(61);
单项选择题
A.select sal,decode(sal>3000,'A',sal>2000,'B','C') grade from emp;
B.select sal,decode(sal,3000,'A',2000,'B','C') grade from emp;
C.select sal,(case when sal>3000 then 'A' when sal>2000 then 'B' else 'C' end) grade from emp;
D.select sal,(if sal>3000 then 'A' elsif sal>2000 then 'B' else 'C' end if) grade from emp;
单项选择题
A.SUBSTR(V_NUM,1,2)
B.TRUNC(V_NUM,2)
C.TRUNC(V_NUM,-2)
D.ROUND(V_NUM,2)
E.ROUND(V_NUM,-2)
单项选择题
A.服务器的侦听端口,默认为1521
B.服务器的侦听端口,默认为7778
C.中间层的接入端口,默认为1521
D.中间层的接入端口,默认为7778
E.以上所述都不正确