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https://issues.apache.org/jira/browse/DERBY-1748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851288#action_12851288
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Gunnar Grim commented on DERBY-1748:
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The Wikipedia entry on Collation references this article:
http://www.unicode.org/reports/tr10/
For the normal user I believe it is sufficient to know that the strength values
PRIMARY, SECONDARY and TERTIARY handle differences in base characters, accents
and case, respectively. If you know your own language you will know what that
means. For example, anyone who knows Swedish will know that the letters A and Ä
are different even with PRIMARY strength. The dots are not an accent in Swedish
although in another language they may well be.
Therefore, I think that the text I suggested for the dev guide is detailed
enough. Perhaps you could add a recommendation to use PRIMARY if you want Derby
to behave like MySQL, MS SQL Server and probably most other DBMS'es do by
default.
> Global case insensitive setting
> -------------------------------
>
> Key: DERBY-1748
> URL: https://issues.apache.org/jira/browse/DERBY-1748
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Reporter: Terry
> Assignee: Kim Haase
> Attachments: collation-strength-1.diff, collation-strength-2.diff,
> collation-strength.diff, devguide.txt, refman.txt, remove_dead_code.diff
>
>
> 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,
> Terry
> 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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