Background
--
create
?
or
?
replace
?
function
?f_must_return(hello?
in
?
varchar2
)?
return
?
varchar2
?
is
??Result?
varchar2
(
20
);
begin
??Result?:
=
?hello?
||
?
'
?world
'
;
??
return
(Result);
end
?f_must_return;







調(diào)用函數(shù)









