我有麻烦编译如下功能的Oracle甲骨文 - PLS-00382:表达式是错误的类型在减去日期
CREATE OR REPLACE FUNCTION fn1
return binary_double
as
Fecha DATE;
Dias binary_double;
begin
dbms_output.put_line(CAST(TRUNC(CURRENT_DATE,'DD') AS DATE) - cast(current_timestamp as date));
return Dias;
end;
它导致错误
Error(8,27): PLS-00382: expression is of wrong type
但是外跑同样的表情函数体
select CAST(TRUNC(CURRENT_DATE,'DD') AS DATE) - cast(current_timestamp as date) from dual
给出预期结果 - 两个日期之间的天数
-0.0607060185185185185185185185185185185185
有什么想法可能是错误的功能?