Questions tagged [collation]
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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questions
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AWS Aurora Postgres 12 Setting Collation
I posted this on stack overflow as well, but didn't get much traction over there. If I am not able to get some thoughts on here, then I will probably open a support ticket with AWS.
I am trying to set ...
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1answer
23 views
Collation for accent-insensitive comparison on Postgres?
On PG 13 documentation, there are several examples of ICU collations for specialized purposes. It is also mentioned that ICU locales exist that allow creating collations to ignore accents, and that ...
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1answer
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Can I set in MariaDB the collation based on a IETF language tag?
I have an application where each user account can set their preferred application language. I store those language preferences as IETF BCP47 language tag (e.g. "de", "en-US"). Now, ...
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4answers
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Why can't set variables related collation as utf8mb4_unicode_ci?
Show mysql version here:
mysql --version
mysql Ver 15.1 Distrib 10.5.11-MariaDB, for debian-linux-gnu (x86_64) using EditLine wrapper
And my mariadb's configuration file.
cat /etc/mysql/mariadb....
3
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1answer
82 views
case sensivity incongruity
I'm trying to learn and understand collations and how postgresql compare and order strings but I'm finding an incongruity and I don't know what I'm missing.
The query:
SELECT datname, datcollate FROM ...
14
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1answer
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Why does a comparison between 'tr' & 'tR' fail on a SQL Server with Vietnamese_CI_AI collation?
There seems to be something special about 'tR' in Vietnamese collation. Appreicate if anyone who knows about it can explain in simple terms.
This issue was discovered during the installation of our ...
1
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1answer
47 views
What is the impact of converting latin1/latin1_swedish_ci to utf8mb4/utf8mb4_unicode_ci?
I was facing some issues with the character's encoding. Those are resolved by updating the CHARACTER and COLLATE for some columns in the table. So my concern is if this conversion is safe? Or does ...
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1answer
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MySQL dump to MariaDB issue with collation
I have a django app running on a staging server (windows server 2012) with a MariaDB database. I have a git hook running mysqldump locally when I push to the staging branch. On the server I have a ...
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1answer
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What does this statement mean: SELECT ... COLLATE SQL_Latin1_General_CP1_CI_AS AS [-- Logins To Be Created --]
What does this statement mean?
SELECT ... COLLATE SQL_Latin1_General_CP1_CI_AS AS [-- Logins To Be Created --]
It is part of a script I'm trying to adapt for listing out the SQL Server logins in an ...
4
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1answer
192 views
What is difference between Arabic_100_CS_AS_KS_WS_SC_UTF8 and Latin1_General_100_CS_AS_KS_WS_SC_UTF8?
Starting from SQL Server 2019, it supports UTF-8 as collation. However, according to the following queries:
SELECT COLLATIONPROPERTY('Arabic_100_CS_AS_KS_WS_SC_UTF8', 'CodePage')
SELECT ...
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2answers
402 views
Best General Purpose Character Set and Collation for MySQL
Currently, whenever I create a new MySQL database, I use utf8mb4 as a character set and utf8mb4_unicode_520_ci for the collation, e.g.:
CREATE DATABASE IF NOT EXISTS db_name
DEFAULT CHARACTER SET ...
1
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1answer
463 views
Cannot resolve the collation conflict between "Latin1_General_CI_AS" and "SQL_Latin1_General_CP1_CI_AS" in the equal to operation
Need urgent help on this. We have applied latest sql patches on one of the server (SQL 2014, SP3, CU4) and somehow we were not able to start the SQL due to following error.
Cannot resolve the ...
0
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1answer
200 views
Storing emojis in MySQL
I'm new to MySQL database. I want to store emojis in my database. I already have data in my database, and I don't want to lose it.
I don't know the proper way of storing the utf8mb4 character-set ...
5
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1answer
365 views
Msg 6355 "Conversion of one or more characters from XML to target collation impossible" when querying sys.dm_exec_query_plan
I like to find missing indexes on the go, looking at the execution plans!
It can potentially give me an indication where further to look at if I want to improve something that is currently running.
...
2
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1answer
86 views
Equivalent of utf8_general_ci in Postgres/ICU?
In MySQL there is a collation utf8_general_ci which provides case-insensitive comparisons in a variety of languages. For example, these are all 1 (true):
SELECT 'ı' = 'I' SOLLATE 'utf8_general_ci';
...
2
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1answer
179 views
Is there a difference between text_pattern_ops and COLLATE "C"?
If I have a text column name with a collation, for example tr-TR, and I run a query
SELECT * FROM t WHERE name LIKE 'a%'
then this will do a seq scan.
If I now create an index
CREATE INDEX ON t(name ...
2
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2answers
373 views
How to create a new column in SELECT CASE when string contains Arabic words?
I have a problem with a select case when statement, I would like to add a new column in the select case when statement, I got the result but with ????? because I have set the column to Arabic words, I ...
0
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2answers
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Strange behavior of TOP 1 clause sql server
I have a SQL Server database and restored it on another server on a different machine. Now I run following same query on both DBs which produces same below result set.
select person_id, visit_id, ...
3
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3answers
447 views
to change collation for system database SQL Server 2017
We are using fresh SQL Server 2017 CU23 Standard Edition database with "SQL_Latin1_General_CP1_CI_AS". Now, I want to change all system databases (master , model , temp, msdb) to another ...
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1answer
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MySQL illegal mix of collations, ASCII to UTF-8
I have a MySQL 8.0 table like this, which is UTF-8 apart from one field, which holds an ASCII UUID that doesn't need UTF-8 overhead:
CREATE TABLE `things` (
`id` bigint unsigned NOT NULL ...
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2answers
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How do I fix the Code Page in SSIS Lookup Transformation to be 65001?
I have an SQL server 2019 with databases and tables all set with the collation Latin1_General_100_CI_AS_SC_UTF8.
The relevant table has code and desc columns which are both of data type varchar.
In ...
1
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1answer
161 views
Is LC_COLLATE different from COLLATE?
Postgres 12 on Windows 7
This works:
CREATE DATABASE "foo"
ENCODING 'UTF8'
LC_COLLATE = 'en-US'
LC_CTYPE = 'en-US'
TEMPLATE template0
Afterwards, running SHOW LC_COLLATE ...
6
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3answers
805 views
How to treat numbers within strings as numbers when sorting ("A3" sorts before "A10", not after)
For all of these queries:
SELECT label FROM personal.storage_disks ORDER BY label ASC;
SELECT label FROM personal.storage_disks ORDER BY label COLLATE "C" ASC;
SELECT label FROM personal....
1
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1answer
346 views
Does PostgreSQL handle case-insensitive database as good as others? [closed]
First things first, please forgive me if my question seems so naive (I am not a DBA).
I look up to see how can I make PostgreSQL case-insensitive and I found the Nondeterministic Collations section of ...
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3answers
76 views
Handle development issues when dealing with different collation for the instance/database setting
Looking for some guidance on how we can handle the scripts/schemas when being run on different collation in sql server.
We have a process where multiple stored procs are created lets say with schema ...
1
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3answers
455 views
Japanese characters in VARCHAR column using Japanese_Unicode_CI_AS
I am loading a table with the Japanese names from CSV file that are changing into question marks into SQL Table. The table that is storing these values is a varchar column. I understand that the ...
4
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3answers
3k views
Case Insensitive ORDER BY clause using COLLATE
I have spent a long time looking for this, and I am getting mixed messages.
In other DBMSs (tested in SQLite, Oracle, MariaDB, MSSQL) I can override the default sort order using the COLLATE clause:
...
2
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1answer
129 views
postgres: do I really need to use Collate and Ctype when restoring database?
Need to import in Linux a Windows postgres exported database.
In windows it's listed as follows:
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----...
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1answer
494 views
Changing collation of SQL Database in Production environment to minimize downtime
We have a scenario in which we want to change the collation of our production database (including columns) from SQL_Scandinavian_Pref_CP850_CI_AS to Finnish_Swedish_CI_AS. We have developed scripts to ...
4
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1answer
479 views
SQL Server with French_CI_AS Collation date conversion
I have a French installation of SQL Server using French_CI_AS Collation. For legacy reasons, a table column stores data as VARCHAR which is later converted to the right type, akin to variant in C++.
...
4
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1answer
492 views
What is the difference between different utf8mb4 binary collations?
What is the difference between utf8mb4_0900_bin vs utf8mb4_bin binary collations?
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1answer
520 views
ERROR: collation "database_default" for encoding "UTF8" does not exist
Moving application from SQL Server to PostgreSQL Database. I am getting this error from one of the queries used in a Java file:
ERROR: collation "database_default" for encoding "UTF8&...
0
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1answer
341 views
Is it possible to specify a different collation for the data vs the entities within a single database?
I have a database with a case sensitive collation because the data inside of it should be treated as case sensitive in the context of how it's used.
The entities and their column names within that ...
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4answers
1k views
Error "the system cannot find the file specified" when opening a large SQL Server file
I have generated the script of my whole SQL Server database into a file and it's more than 36 GB. When I try to open it, I get the following error:
The system cannot find the file specified.
At ...
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1answer
669 views
What is the SQL Server equivalent for Oracle character set AL32UTF8?
While porting data from oracle to Azure sql database I am facing the following issue where, empty data in Oracle is converted as ➞➞➞ in SQL Server
Pic1: Data as in Oracle DB;
Pic2: Data as in Sql ...
0
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1answer
185 views
postgresql 12.3 convert existing DB to use case-insensitive collation?
postgresql 12.3 in a container with Alpine Linux 3.10
I would like to convert an existing DB to use case-insensitive collation. Is it possible? I mean, without dropping it and recreating from scratch.
...
4
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2answers
378 views
Does MySQL 8 ASCII vs utf8mb4_0900_ai_ci size differ when only using ASCII characters?
If I only use only ASCII characters, will VARCHAR (255) with utf8mb4_0900_ai_ci be larger on disk than VARCHAR (255) using ASCII?
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1answer
157 views
Change collation in easy way
I'm a developer and sometime I face with restoring a DB with a different collation than the server.
Our application uses the tempdb too and as result some joins fail due of the different collation.
So ...
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2answers
166 views
Changing from utf8 to utf8mb4
MySql database at the moment has:
Character Set: utf8
Default Collation Name: utf8_unicode_ci
I want to change it to:
utf8mb4
utf8mb4_unicode_ci
I would also do the same thing for all tables in ...
4
votes
1answer
2k views
PostgreSQL nondeterministic collations are not supported for LIKE
I am using Postgresql v12.
I created a collation like this:
CREATE COLLATION ci (provider = icu, locale = 'tr_TR', deterministic = false);
I used that collation in a table:
create table testtable1 ...
0
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0answers
207 views
How to convert UTF8 general in UTF8 unicode?
Short:
My tables have the collation utf8mb4_unicode_ci, but the data itself is utf8mb4_general_ci and now I like to know how I can convert it into unicode?
Long:
I used this query to convert all my ...
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3answers
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Is there any performance issue with including the "COLLATE" as part of the query as opposed to setting it for the column/table?
PostgreSQL has this "collate" concept. You can either tell a table's column to always have a "collate", or you can do it in the query.
If I do it in the query, does PG punish me somehow performance-...
2
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1answer
491 views
What is the meaning of "-x-icu" in PostgreSQL's "collates"?
I had this query:
SELECT * FROM table ORDER BY label ASC;
Since the labels are not in English, they didn't get sorted in the right order (ones beginning with "ö" were not in the bottom/end).
I ...
4
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2answers
263 views
sp_Blitz fails with collation error
SQL Server version (output from select @@VERSION): Microsoft SQL Server 2017 (RTM-CU19) (KB4535007) - 14.0.3281.6 (X64) (Build 14393: )
Installed sp_Blitz from Brent Ozar, stored procedure creates ...
0
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1answer
195 views
Sybase ASE 15.7 sort ordering
I have my sort ordering in Sybase as:
45 190 altdict - Alternate (lower-case first) dictionary ordering
Am I right that alternate means "aAbBcC..zZ" ordering?
What should I do to change ordering ...
3
votes
1answer
952 views
MySQL 8.016 master with MariaDB 10.2 slave on AWS RDS, Character set '#255' is not a compiled character set
I have a MySQL 8.016 master and a MariaDB 10.2 slave, both running on AWS RDS. This was working perfectly until today, when I figured I wanted to do chain replication instead, like this
MySQL 8.016 ->...
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1answer
27 views
MySql8 Trailing String comparison
I am planning an upgrade of a legacy MySQL5.6 Database to MYSQL8.0.19 database.
All my testing has been successful but have one issue preventing me from going live.
By default in MYSQL5.6 the ...
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2answers
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How to force mysqldump to produce /*!40101 SET character_set_client = utf8mb4 */;
I am attempting to dump my database, which is set to, and only contains, utf8mb4 and appropriate collations. I use the following line:
mysqldump --add-drop-table --add-locks --allow-keywords --...
1
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1answer
302 views
Different collation between System and User databases in SQL Server [duplicate]
Recently, I have came across a situation where I found there is different SQL Collation is set for System databases and user databases on a sql instance in production.
Like: Danish_Norwegian_CI_AS ...
8
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1answer
650 views
Is it possible to determine the default Collation and server version of a database without a full restore?
I work for a company who regularly receives large SQL database backups from clients for support purposes. We support multiple SQL versions and collations, but currently have to manually confirm our ...
