On Thu, 28 Mar, 2019, 4:33 PM Steve Atkins, <st...@blighty.com> wrote:
>
>
> > On Mar 28, 2019, at 8:29 AM, Ron <ronljohnso...@gmail.com> wrote:
> >
> > On 3/28/19 3:23 AM, Sameer Kumar wrote:
> > [snip]
> >> You can write a query with upper function:
> >>
> >> select * from emp where upper(ename)=upper('aaa');
> >
> > That's a guaranteed table scan.
>
> Unless you have an index on upper(ename).
>
Yup, with this or overloading "=", one can create an expression based index
and benefit from it.
> Cheers,
> Steve
>
>
>
>
