A collation is a set of rules that determine how data is sorted and compared for comparing characters in a character set.

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How to create Postgres DB with case insensitive collation

I am using the postgres version 9.4.1 64-bit on windows 7 64-bit. I need to create DB with the setting "case sensitive = OFF" but couldn't make this work. I refereed already many question on SO and ...
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Should I use utf8_unicode_ci or utf8_slovak_ci?

I was using utf8_slovak_ci collation until now, but I read that utf8_unicode_ci sorts very wide range of languages. Does it mean, I do not need to use separate collation for every language and I can ...
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52 views

Removing per column and table collation and charset

I recently completed a transition of a database from CHARSET=utf8 COLLATE=latin1 to CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci. During the process tables were migrated one at a time by altering their ...
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How to convert a MySQL database from utf8mb4 to utf8?

I would like to convert a MySQL database, which has utf8mb4 character set and utf8mb4_unicode_ci collation, to utf8 and utf8_unicode_ci. How to do that please? Thank you in advance for your ...
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81 views

How can I find duplicate key violations in a different collation?

I have a MySQL table that has the collation for one of its varchar columns in the primary key set to utf8_general_ci. I want to change the collation to utf8_unicode_ci so it stops treating "gmail.com" ...
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Implicitly (or proxy) convert to Nvarchar on incoming queries from legacy or 3rd party applications

We have a 3rd party application of which we don't have the source code. This application executes queries on our database without using the "N" prefix before literal strings. It does this in inserts ...
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40 views

converting mysql datebase

I have a question about converting mysql databases, I doing now new site, and want to use my old database, which is in latin_swedish_1 colacolation I want to convert this old database into ...
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Why is my PostgreSQL ORDER BY case-insensitive?

I have Postgres 9.4.4 running on Debian and I get the following ORDER BY behavior: veure_test=# show LC_COLLATE; lc_collate ------------- en_US.UTF-8 (1 row) veure_test=# SELECT ...
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utf8mb4 in SQL Server Express

We have some web applications based on databases using utf8mb4 as character set and utf8mb4_Standard as collation. We saw that we can use any character we want with this setting. In SQL Server ...
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51 views

Performance Implications of Explicit Collation Conversions across Linked Servers

I locally host host databases from two vendors on two different SQL instances, but on the same network. These servers frequently communicate with each other (through joins and whatnot), so we have ...
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Avoiding Functions() in the Where clause

Okay, while analyzing queries against a SQL Server 2008 R2 database, I happened upon the following query: (@p__linq__0 nvarchar(4000)) SELECT TOP (1) [Extent1].[OrderSOId] AS [OrderSOId], [Extent1] ...
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SQL Server 2008 R2 SP2 Execution Plan not getting missing index suggestions

I have several SQL Server 2008 R2 SP2 that have server collation Latin1_General_BIN. These instances will not give me the missing index suggestion with performing an execution plan. I have other ...
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Speed up changing of collation?

I'm trying to change collation on all our databases, and doing it on one of the databases (~15gb) took me 42 minutes in testing even though I put it on SSD disc. Do anyone know any way to speed it up? ...
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198 views

mysql/mariadb: ifnull changes collation

It seems that 'ifnull' changes the default collation that is set to be used. I have tried on both mysql and mariadb: Server version: 5.5.34-MariaDB-1~precise-log mariadb.org binary distribution ...
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764 views

SQL Server: Collation of the resource database

I'm trying to use stopwords so that some words are skipped by the Full-Text Indexer. I can add those stopwords in the table sys.fulltext_stopwords. When trying to get a list of stopwords and ...
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What would make a MySQL database create tables in a different collation other than its default?

I am adding tables to a Wordpress database on my localhost and it is changing my collation from utf8_general_ci to latin1_swedish_ci. I'm kinda stumped because I'm not familiar with working directly ...
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470 views

Why not use SQL_Latin1_General_CI_AS for a global system?

What would be some really good reasons to not use the SQL_Latin1_General_CI_AS collation on a system which handles English, German, Japanese, and Chinese data? I'm having a really hard time finding ...
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Firebird 2.5 - difference between starting with and = (equal) string searches

Background I have DB that was created on Windows, FB 2.5.0 (long ago). It was subsequently upgraded, over the years, to 2.5.4. Yesterday I wanted to test it on Ubuntu, which has FB 2.5.2 maintained ...
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Where can I find exact rules of a collation?

Is there any documentation anywhere for the exact sorting/equality rules defined by a collation in Windows (SQL Server), for instance "Finnish_Swedish_CI_AS"? I know about CI/CS, AI/AS etc, but I'm ...
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mysql collation-server not respected

I've configured my server (5.5.41) with: character-set-server = utf8 collation-server = ...