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Collation 'utf8_general_ci' Is Not Valid For Character Set 'latin1'

Sign up Illegal mix of collations for operation 'concat' up vote 7 down vote favorite 3 I'm trying to execute this concat query in mysql SELECT CONCAT(if(fName,fName,''),Name) From Student Error: #1271 - Illegal mix of collations for operation 'concat' mysql sql share|improve this question edited Oct 13 '11 at 11:48 Johan 48.9k16106202 asked Oct 13 '11 at 11:46 ahmed saud 101138 1 illegal mix of collations utf8_general_ci coercible and latin1_swedish_ci numeric for operation can you describe your current Student table structure? –Gajahlemu Oct 13 '11 at 11:47 Student=> id int ,Name varchar, fName varchar –ahmed saud Oct 13 '11 at 11:48 What collations do the columns have? –Pekka 웃 Oct 13 '11 at 11:53 do you have fix the issue? –Gajahlemu Oct 13 '11 at 12:12 no i didn't may be it'a mysql bug –ahmed saud Oct 13 '11 at 19:59 add a comment| 6 Answers 6 active oldest votes up vote 13 down vote The charsets and/or collations you use in your connection do not match the charset/collation in your table. There are 4 solutions: 1- Change the charset in your connection: //find out the charset used in your table. SHOW TABLES LIKE 'student' //set the server charset to match SET NAMES 'charset_name' [COLLATE 'collation_name'] 2- Change the charset used in your table to match the server charset: //find out the charset used in the server SHOW VARIABLES LIKE 'character_set%'; SHOW VARIABLES LIKE 'collation%'; //Change the charset used in the table ALTER TABLE student ...... 3- Change th

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Illegal Mix Of Collations For Operation 'union'

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Collate Mysql

them; it only takes a minute: Sign up Illegal mix of collations MySQL Error up vote 42 down vote favorite 21 I'm getting this strange error while processing a large number of data... Error Number: 1267 Illegal mix of http://stackoverflow.com/questions/7753608/illegal-mix-of-collations-for-operation-concat collations (latin1_swedish_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '=' SELECT COUNT(*) as num from keywords WHERE campaignId='12' AND LCASE(keyword)='hello again 昔 ã‹ã‚‰ ã‚ã‚‹ å ´æ‰€' What can I do to resolve this? Can I escape the string somehow so this error wouldn't occur, or do I need to change my table encoding somehow, and if so, what should I change it to? mysql sql mysql-error-1267 share|improve this question edited Feb 27 '12 at 4:20 OMG Ponies 199k37360417 asked Jun 17 '09 http://stackoverflow.com/questions/1008287/illegal-mix-of-collations-mysql-error at 16:49 Click Upvote 66.8k176451621 add a comment| 3 Answers 3 active oldest votes up vote 119 down vote accepted SET collation_connection = 'utf8_general_ci' then for your databases ALTER DATABASE db CHARACTER SET utf8 COLLATE utf8_general_ci ALTER TABLE table CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci MySQL sneaks swedish in there sometimes for no sensible reason. share|improve this answer answered Jun 17 '09 at 16:59 Ben Hughes 10.1k13032 2 works like a charm :) –Shiv Deepak Nov 28 '12 at 19:25 1 Fantastic friend. it work great. thanks. –Sagotharan Mar 14 '13 at 10:31 2 @Ben: Thank you for a directly copy-pastable solution. Saved me lots of time. –Pistos Oct 3 '13 at 16:57 9 @Ben: It was initially developed by a Swedish company... That is the reason behind the annoying latin1_swedish_ci initial setting.. :( –Vajk Hermecz Sep 29 '14 at 7:45 1 I didn't have permissions to do the first statement but it worked just doing the table –Rob Sedgwick Mar 4 '15 at 14:04 | show 4 more comments up vote 4 down vote You should set both your table encoding and connection encoding to UTF-8: ALTER TABLE keywords CHARACTER SET UTF8; -- run once and SET NAMES 'UTF8'; SET CHARACTER SET 'UTF8'; share|improve this answer answered Jun 17 '09 at 16:59 Quassnoi 263k51432485 Are both of these needed, or can i just do one o

Importance Assigned to Milestone MySQL Server Edit Unknown Unknown mysql-bugs #69214 You need to log in to change this bug's status. Launchpad doesn't https://bugs.launchpad.net/bugs/1179460 support importing bugs from PHP Project Bugtracker bug trackers. (what does this https://airbladesoftware.com/notes/fixing-mysql-illegal-mix-of-collations/ mean?) Affecting: MySQL Server Filed here by: Valerii Kravchuk When: 2013-05-13 Target Distribution Baltix BOSS Juju Charms Collection Elbuntu Guadalinex Guadalinex Edu Kiwi Linux nUbuntu PLD Linux Tilix tuXlab Ubuntu Ubuntu Linaro Evaluation Build Ubuntu RTM Package (Find…) Project (Find…) Status Importance Unknown Unknown Assigned to unknown Remote Watch illegal mix None, the status of the bug is updated manually. None, the status of the bug is updated manually. MySQL Bug System #60101 MySQL Bug System #69214 URL: The information about this bug in Launchpad is automatically pulled daily from the remote bug. This information was last pulled 11 hours ago. Comment on this change (optional) Email me about changes to this illegal mix of bug report Percona Server Edit Status tracked in 5.7 5.1 Invalid Undecided Unassigned Edit You need to log in to change this bug's status. Affecting: Percona Server 5.1 Filed here by: Valerii Kravchuk When: 2013-05-13 Completed: 2013-05-13 Status Importance Invalid Undecided Assigned to Nobody Me Comment on this change (optional) Email me about changes to this bug report 5.5 Triaged Medium Unassigned Edit You need to log in to change this bug's status. Affecting: Percona Server 5.5 Filed here by: Valerii Kravchuk When: 2013-05-13 Confirmed: 2013-05-13 Status Importance Triaged Medium Assigned to Nobody Me Comment on this change (optional) Email me about changes to this bug report 5.6 Triaged Medium Unassigned Edit You need to log in to change this bug's status. Affecting: Percona Server 5.6 Filed here by: Valerii Kravchuk When: 2013-05-13 Confirmed: 2013-05-13 Status Importance Triaged Medium Assigned to Nobody Me Comment on this change (optional) Email me about changes to this bug report 5.7 Triaged Medium Unassigned Edit You need to log in to change this bug's status. Affecting: Percona Server 5.7 Filed here

dreaded illegal-mix-of-collations error. The occasional query would result in Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '='. MySQL’s default character set is latin1 with an adventurous Swedish collation, which presumably seemed like a good idea at the time. However Rails uses UTF-8 everywhere and from time to time the two collations collide. Fortunately this problem is not new and clever people have already solved it: see Getting out of MySQL Character Set Hell and Fixing a MySQL Character Encoding Mismatch. Those two articles advise more or less the same process. Here I’m just jotting down some notes where I found something confusing or ambiguous in case I ever have to do this again. Order of events After exporting the data and hacking the dump file, I wasn’t sure whether to configure MySQL for UTF-8 and then import the data, or the other way round. I chose to import the data and then configure MySQL to avoid double-encoding the data. It seems to have worked. It silently truncated all my accented text but I was able to fix that. Take stock First figure out where you stand. In MySQL do this: mysql> show variables like 'char%'; The result you want is this: +--------------------------+----------------------------+ | Variable_name | Value | +--------------------------+----------------------------+ | character_set_client | utf8 | | character_set_connection | utf8 | | character_set_database | utf8 | | character_set_filesystem | binary | | character_set_results | utf8 | | character_set_server | utf8 | | character_set_system | utf8 | | character_sets_dir | /usr/share/mysql/charsets/ | +--------------------------+----------------------------+ At this stage several of these values will be latin1. Similarly for collation: mysql> show variables like 'collation%'; +----------------------+-----------------+ | Variable_name | Value | +----------------------+-----------------+ | collation_connection | utf8_general_ci | | collation_database | utf8_general_ci | | collation_server | utf8_general_ci | +----------------------+-----------------+ The utf8_general_ci collation will do but ideally we want utf8_unicode_ci. The former basically ignores all accents: it treats ‘ü’ the same as ‘u’. The latter pays attention to accents; it’s a tiny bit slower but more accurate. To se

 

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