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From Satheesh Bandaram <sathe...@Sourcery.Org>
Subject Re: Case Sensitivity
Date Fri, 04 Mar 2005 01:27:38 GMT
I personally like the functional indexes. I think they are useful for
all cases where querries have expressions in predicates.

Satheesh

Jeremy Boynes wrote:

> This is a subject that keeps coming up on the mailing lists so is
> probably worth addressing.
>
> One challenge we face is that many users are likely to be considering
> Derby as an alternative to MySQL which by default uses a
> case-insensitive collation. This is legal SQL, just different from
> most other databases (Oracle, DB2, SQL Server (which actually allows
> you to choose when you create the database)).
>
> The standard way of solving this would be to support user-specified
> character sets and collations per the spec but
> 1) that's likely to be a lot of work
> 2) I don't know of another database that actually does this the way
>    the spec says, making us "different", and
> 3) it is likely to be more confusing than helpful
>
> Other options include:
> a) support collation specification at the schema level like SQL Server
> b) support function-based indexes, so users can create indexes
>    on UPPER(col) to reduce the performance hit
> c) just document and offer workarounds (like adding a second column)
> d) change Derby to be like MySQL (gets a -1 from me but ...)
>
> Thoughts?
> -- 
> Jeremy
>
>
>


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