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From "Terry (JIRA)" <derby-...@db.apache.org>
Subject [jira] Created: (DERBY-1748) Global case insensitive setting
Date Tue, 22 Aug 2006 22:24:13 GMT
Global case insensitive setting

                 Key: DERBY-1748
                 URL: http://issues.apache.org/jira/browse/DERBY-1748
             Project: Derby
          Issue Type: New Feature
            Reporter: Terry

By default MySQL is case insensitive in its string comparisons, as you can see from the MySQL
docs shown below. Similar functionality is available in Sybase iAnywhere and in SQLServer.
I'd like the same to be true for Derby.

What, I wonder, are chances of that?

I am aware that functions could be used to force comparisons in upper case but that subverts
the indexes and makes searches unacceptably long.

If you were to ask people you might find that this is a feature whose abscence is causing
many to look elsewhere.

thanks for all the great work,


The MySQL Docs say:

-------- start quote

 By default, MySQL searches are not case sensitive (although there are some character sets
that are never case insensitive, such as czech). This means that if you search with col_name
LIKE 'a%', you get all column values that start with A or a. If you want to make this search
case sensitive, make sure that one of the operands has a case sensitive or binary collation.
For example, if you are comparing a column and a string that both have the latin1 character
set, you can use the COLLATE operator to cause either operand to have the latin1_general_cs
or latin1_bin collation. For example:

col_name COLLATE latin1_general_cs LIKE 'a%'
col_name LIKE 'a%' COLLATE latin1_general_cs
col_name COLLATE latin1_bin LIKE 'a%'
col_name LIKE 'a%' COLLATE latin1_bin

If you want a column always to be treated in case-sensitive fashion, declare it with a case
sensitive or binary collation. See Section 13.1.5, "CREATE TABLE Syntax". 

    By default, the search is performed in case-insensitive fashion. In MySQL 4.1 and up,
you can make a full-text search by using a binary collation for the indexed columns. For example,
a column that has a character set of latin1 can be assigned a collation of latin1_bin to make
it case sensitive for full-text searches.

--------------- end quote

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