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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3 answers
242 views

Differences in PostgreSQL 14 collation behavior on Linux and Mac

I have PostgreSQL installed on my Mac and Ubuntu Server as shown below: atsweb=# select version(); version ...
5 votes
1 answer
57 views

postgresql matching or converting utf-8 variant strings

Postgres 13 I am looking for a way to search UTF-8 text that may have variant character representations ( what is the proper term for this? ie 𝐋𝐈𝐅𝐄 vs life ) within postgresql. I am running into ...
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4 votes
1 answer
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Using collations with JSONB

I have a postgres database and a case insensitive collation. The collation was created by CREATE COLLATION IF NOT EXISTS case_insensitive (provider = icu, locale = 'und-u-ks-level2', deterministic = ...
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0 votes
1 answer
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Modify Collation of a column

mysql Ver 8.0.25 Got this error in apache log: Error query: SQLSTATE[HY000]: General error: 1267 Illegal mix of collations (utf8mb4_unicode_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation ...
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2 votes
2 answers
51 views

Numeric collation sorts by digits instead of value- postgres

I have a table of users with ids in the following form user123@domain.com. When searching and sorting the users, I need user1@domian.com to be before user14@domain.com but since 4 is “smaller” than @ ...
2 votes
1 answer
100 views

sp_blitz fails with: Msg 468, Level 16, State 9 Cannot resolve collation conflict between "SQL_Latin1_General_CP1_CI_AS" and "Latin1_General_BIN"

Has anyone had an issue with running sp_blitz on an instance using the Latin1_BIN collation? I created the stored procedure without error, but when I ran it I got the following error message: Msg 468, ...
2 votes
1 answer
149 views

Collation conflict when creating stored procedure

I'm trying to create a stored procedure but it gives me the error message Cannot resolve the collation conflict between "SQL_Latin1_General_CP1_CI_AS" and "Latin1_General_BIN2" in ...
5 votes
2 answers
342 views

Case-Sensitive Collation on a select query in SQL Server

Our SQL Server's collation is set to SQL_Latin1_General_CP1_CI_AS I have a requirement where we have the same values with different cases but SQL Server treats them the same since our collation is set ...
4 votes
1 answer
477 views

Fix corrupted utf8 nvarchar value that was inserted without N prefix

Is it possible to restore the UTF8 data from a corrupted nvarchar, that was used without the N prefix? For example, in the following snippet, I'd like @n1_fixed to have the correct value based on @n1: ...
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6 votes
2 answers
312 views

Collation conflict when comparing sql_variant with varchar literal

I found that queries below return different results on two Azure Hyperscale databases that are running the same compatibility level, same set options etc. IF CAST(ServerProperty('Edition') AS nvarchar(...
5 votes
2 answers
227 views

At finding a substring, find the end position as well

A LIKE clause can test if a string occurs in another and the CHARINDEX function can give the start position of the first match. In my case, I'm interested in the end position though, which is, due to ...
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7 votes
4 answers
380 views

Relationships between like matching and comparison

Naively I assumed that the relationship between a like 'foo%' and a >= 'foo' is that the latter matches the former and some additional rows that come after in the index order. More generally, I ...
  • 745
2 votes
1 answer
321 views

simulate case sensitive collation in ssms

I know that it is not possible to set a collation for a session in sql server. I have different servers with different collations, however, one of them is a case sensitive collation and that can be ...
0 votes
1 answer
251 views

SQL Server collation and its equivalent in Postgres

Legacy system, backed by SQL Server, has unique indexes using collation Latin1_General_CP1_CI_AI. It compares things using charset Latin 1, encoded using CP-1252 (CP1 part), case insensitive, accent ...
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2 votes
1 answer
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SQL Server PATINDEX issue/bug when using different case-sensitive collations

I have a function (which I found here years ago) that uses STUFF / PATINDEX to strip out non-alphanumeric characters from a string. When running on a Case Insensitive collation, it works fine. ...
1 vote
1 answer
152 views

Case sensitivity not working

I have an issue where I keep getting the value 'CtP_PETER_Fact' out of the query below. It should be a case sensitive where-clause. I tried it in a few different ways: setting the COLLATE statement ...
2 votes
2 answers
789 views

MySQL What charset/collation for Case insensitivity and Accent sensitivity?

I am looking for a charset/collation that would make it so when I do a SELECT * FROM table_name WHERE username = "Warrior" It only returns me the rows where username = "Warrior", ...
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4 votes
1 answer
3k views

Storing special characters (German, French, Spanish) in SQL Server result in weird strings

I'm trying to store the German ß in SQL Server, but it results in ß. For example "Gleimstraße" is stored as "Gleimstraße" But this also happens for other characters: "König-...
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1 vote
1 answer
662 views

mysql: setting default default_collation_for_utf8mb4?

How to set the value for "default_collation_for_utf8mb4" to "utf8mb4_general_ci", globally , or when the mysql 8.0 server started ? I tried [mysqld] init_connect='SET ...
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6 votes
1 answer
2k views

Sort order with numbers as strings

For demonstration purposes, I have a sample table with a varchar column called numberstring with the values: -4 32 0 4 16 8 -8 1024 When selecting using ORDER BY numberstring, I find that different ...
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0 votes
1 answer
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Collation won't set when creating new database

I am trying to set the collation for a new database in PostgreSQL 13 but it does not seem to take effect: postgres=# CREATE DATABASE assets ENCODING 'UTF8' LC_COLLATE 'C' LC_CTYPE 'en_US.UTF-8'; ...
2 votes
1 answer
48 views

Alter the collation of a column in temp-file

I have a routine in a DB that uses a temp-file. But the collation of the DB doesn't match the collation of the temp-DB. I can't change the collation of the DB, it's a client DB. I tried this: BEGIN ...
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1 vote
1 answer
4k views

Change SQL Server 2019 instance Collation After installation, and new problem

How to made this problem on SQL Server 2019 Install SQL Server with wrong collation 2month ago Revived a report from SharePoint admin about has a problem with collation Resolve problem with MSSQLTIPs ...
1 vote
2 answers
241 views

Determine Ideal Collation Set for correct data storage

Alright so I have a MariaDB DB and I've just noticed some weird storage issues, like the following: My JSON columns (which in MariaDB are LONGTEXT) have an automatically set collation of utf8mb4_bin. ...
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4 votes
2 answers
791 views

Identify the query causing collation conflict

I have inherited a new SQL Server database instance. The SQL Server Agent error Log is full of collation errors - new errors are arising every 10 seconds. But detail of error is minimal - 'cannot ...
2 votes
1 answer
216 views

How to reverse only English words?

I've an nvarchar column with English and Hebrew letters in some fields. In the fields where the English and Hebrew are together, the English letters are in reverse order (this is how the ERP program ...
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1 vote
2 answers
538 views

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 ...
1 vote
1 answer
849 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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1 vote
1 answer
100 views

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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0 votes
4 answers
544 views

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....
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3 votes
1 answer
102 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 ...
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14 votes
1 answer
1k views

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 vote
1 answer
825 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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1 vote
1 answer
1k views

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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0 votes
1 answer
292 views

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 ...
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4 votes
1 answer
550 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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4 votes
2 answers
5k 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 ...
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1 vote
1 answer
2k 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 ...
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1 vote
1 answer
3k 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 votes
1 answer
2k 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 votes
1 answer
489 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'; ...
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3 votes
1 answer
2k 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 ...
  • 527
2 votes
2 answers
933 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 ...
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0 votes
2 answers
157 views

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 votes
3 answers
2k 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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1 vote
1 answer
705 views

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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3 votes
2 answers
7k views

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 vote
1 answer
1k 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 ...
  • 527
12 votes
3 answers
4k 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 vote
1 answer
1k 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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