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Date: Wed, 26 Apr 2006 09:10:57 -0700
From: Craig L Russell <Craig.Russell@Sun.COM>
Subject: Re: Query and uppercases
In-reply-to: <444F9744.5050701@amberpoint.com>
Sender: Craig.Russell@Sun.COM
To: Derby Discussion <derby-user@db.apache.org>
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 <444F9744.5050701@amberpoint.com>


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If you are concerned about performance, please note that there is a =20
huge difference between these two statements:

1. SELECT * FROM CITY_INFO WHERE UPPER(?) =3D CITY_NAME

and

2. SELECT * FROM CITY_INFO WHERE ? =3D UPPER(CITY_NAME)

Query 1 will work if your data is already upper case. You can do an =20
index scan of the table very quickly.

If your data is stored in mixed case, you need query 2, and this will =20=

need to do a table scan because there is no index on the UPPER=20
(CITY_NAME) values. [AFAIK there is no way to implement such an index =20=

on the column. So the index needs to be created with the upper case =20
names. If you need mixed case in the database, you might need another =20=

column just for the upper case index.

Craig

On Apr 26, 2006, at 8:52 AM, Bryan Pendleton wrote:

>> Is there a way to bypass this, so when querying the database it =20
>> does not look at uppercases or lowercases. =E8 Detroit =3D detroit =3D =
=20
>> dEtRoIt =3D =85
>
> Try using the UPPER function:
>
> select * from city_info where UPPER(city_name) =3D 'DETROIT';
>
> thanks,
>
> bryan
>
>


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