create function is_date(p_date in varchar2) return number as v_date date; begin v_date:=to_date(p_date); return 1; --正确 exception when others then return 0; end; /
create function is_date(p_date in varchar2) return Boolean as v_date date; begin v_date:=to_date(p_date); return true; --正确 exception when others then return false; end; /
return number
as
v_date date;
begin
v_date:=to_date(p_date);
return 1; --正确
exception
when others then
return 0;
end;
/
return Boolean
as
v_date date;
begin
v_date:=to_date(p_date);
return true; --正确
exception
when others then
return false;
end;
/