"=?iso-8859-1?Q?frank=5Flupo?=" <frank_lupo(at)email(dot)it> writes:
> I have create a function in 7.2:
>
> CREATE FUNCTION left(text,int2) RETURNS varchar AS '
> I execute a function in 7.3:
>
> test=# select left('pippo',2)\g
> ERROR: Function left("unknown", integer) does not exist
int4-to-int2 conversion is not implicit in 7.3. You'd be better off to
declare the function as taking int --- declaring it as int2 was a useless
anti-optimization even in 7.2, seeing that substring() takes int not
int2.
regards, tom lane