On 3/28/19 3:33 AM, Steve Atkins wrote:
>
>> On Mar 28, 2019, at 8:29 AM, Ron <ronljohnsonjr@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).
Are you sure? I thought the lpart had to be immutable for the query
optimizer to decide to use an index (and upper(ename) is mutable).
--
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