I have a MySQL table with utf8 general ci collation. In the table, I can see two entries:
abad
abád
I am using a query that looks like this:
SELECT * FROM `words` WHERE `word` = 'abád'
The query result gives both words:
abad
abád
Is there a way to indicate that I only want MySQL to find the accented word? I want the query to only return
abád
I have also tried this query:
SELECT * FROM `words` WHERE BINARY `word` = 'abád'
It gives me no results. Thank you for the help.
If your searches on that field are always going to be accent-sensitive, then declare the collation of the field as utf8_bin (that'll compare for equality the utf8-encoded bytes) or use a language specific collation that distinguish between the accented and un-accented characters.
col_name varchar(10) collate utf8_bin
If searches are normally accent-insensitive, but you want to make an exception for this search, try;
WHERE col_name = 'abád' collate utf8_bin
Update for MySQL 8.0, plus addressing some of the Comments and other Answers:
The CHARACTER SET matches the beginning of the COLLATION.
Any COLLATION name ending in _bin will ignore both upper/lower case and accents. Examples: latin1_bin, utf8mb4_bin.
Any COLLATION name containing _as_ will ignore accents, but do case folding or not based on _ci vs _cs.
To see the collations available (on any version), do SHOW COLLATION;.
utf8mb4 is now the default charset. You should be using that instead of utf8.
It is better to have the CHARACTER SET and COLLATION set 'properly' on each column (or defaulted by the table definition) than to dynamically use any conversion routine such as CONVERT().
In my version (MySql 5.0), there is not available any utf8 charset collate for case insensitive, accent sensitive searches. The only accent sensitive collate for utf8 is utf8_bin. However it is also case sensitive.
My work around has been to use something like this:
SELECT * FROM `words` WHERE LOWER(column) = LOWER('aBád') COLLATE utf8_bin
Accepted answer is good, but beware that you may have to use COLLATE utf8mb4_bin instead!
WHERE col_name = 'abád' collate utf8mb4_bin
Above fixes errors like:
MySQL said: Documentation 1253 - COLLATION 'utf8_bin' is not valid for
CHARACTER SET 'utf8mb4'
The MySQL bug, for future reference, is http://bugs.mysql.com/bug.php?id=19567.
Check to see if the database table collation type end with "_ci", This stands for case insensitive...
Change it to collation the same or nearest name without the "_ci" ...
For example... change "utf8_general_ci" to "utf8_bin"
Mke
I was getting the same error.
I've changed the collation of my table to utf8_bin (through phpMyAdmin) and the problem was solved.
SELECT * FROM `words` WHERE column = 'abád' collate latin1_General_CS
(or your collation including cs)
You can try searching for the hex variable of the character, HEX() within mysql and use a similar function within your programming language and match these. This worked well for me when i was doing a listing where a person could select the first letter of a person.
Well, you just described what utf8_general_ci collation is all about (a, á, à, â, ä, å all equals to a in comparison).
There have also been changes in MySQL server 5.1 in regards to utf8_general_ci and utf8_unicode_ci so it's server version dependent too. Better check the docs.
So, If it's MySQL server 5.0 I'd go for utf8_unicode_ci instead of utf8_general_ci which is obviously wrong for your use-case.
That works for me for an accent insensitive and case insensitive search in MySql server 5.1 in a database in utf8_general_ci, where column is a LONGBLOB.
select * from words where '%word%' LIKE column collate utf8_unicode_ci
with
select * from words where'%word%' LIKE column collate utf8_general_ci
the result is case sensitive but not accent sensitive.
I can't convert data from Latin1_swedish to UTF-8.
The application is based on Symfony2 and the database is MySQL.
I've already tried this query:
ALTER TABLE <tablename> CONVERT TO CHARACTER
SET utf8 COLLATE utf8_unicode_ci
and:
ALTER TABLE t MODIFY col1 CHAR(50) CHARACTER SET utf8;
I would like a solution that does all the tables and columns, because MySQL database has 1000 tables. If I had to modify them all manually it would take too long.
Since you mentioned "weird characters", I suspect that "changing from latin1 to utf8" is not the real task, but rather to fix up some kind of mess that happened during INSERTs.
There are about 5 cases to deal with. We don't yet know which case you have. Please provide
SHOW CREATE TABLE for a table that you are trying to change.
SELECT col, HEX(col) ... for some cell that has non-ascii text.
Let's review the attempts:
ALTER TABLE <tablename> CONVERT TO CHARACTER SET utf8;
That assumes the table is declared to be latin1 and correctly contains latin1 bytes, but you would like to change it to utf8. Since 'Ă' and 'Ĺ' do not exist in latin1, this ALTER feels very wrong.
ALTER TABLE t MODIFY col1 CHAR(50) CHARACTER SET utf8;
is similar to the above, but works only one column at a time, and needs exactly the right stuff in the MODIFY clause. Hence, it would be quite tedious.
ALTER DATABASE databasename DEFAULT CHARACTER SET utf8;
merely sets the default CHARACTER SET for any new tables created in that databasename. The word DEFAULT is optional.
HEX('ĂĹ') = 'C482C4B9' -- So it looks like you are working with some Eastern European language, perhaps using utf8, perhaps not. Please provide further details. What came before and after Ă?
The fix for the "weird characters" is probably in my blog, but need details to point you directly.
Have you tried this ?
ALTER DATABASE databasename CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE tablename CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
If you would like to change entire DB you should run this command:
ALTER DATABASE db_name DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
This question already has answers here:
How to MySQL work "case insensitive" and "accent insensitive" in UTF-8
(2 answers)
Closed 8 years ago.
My database features names with special characters e.g. Sigur Rós
The problem is that if you search for the name with regular characters e.g. "Sigur Ros", no results will be returned.
What's the best way to handle this? Is there a tool which I can use, or would I have to find and replace these manually with PHP?
In your database, if you set the collation on the column that contains this data to utf8_unicode_ci, then the sorting and comparisons will ignore accents.
You can alter the table column definition to allow the collation to be automatic:
ALTER TABLE yourTable MODIFY lastName VARCHAR(30) COLLATE utf8_unicode_ci
(See http://dev.mysql.com/doc/refman/5.0/en/charset-column.html)
Alternatively, you can specify the collation when querying the table:
SELECT * from yourTable WHERE lastName COLLATE utf8_unicode_ci = 'ROS'
(See http://dev.mysql.com/doc/refman/5.0/en/string-comparison-functions.html)
Like the Title.
What is the SQL Query To Find in MySQL DB Table without considering the accented letters?
So, if I search "abcdè" I find "abcde"
By default utf8 strings ignore accents as they use the utf8_general_ci collation.
If you're not using utf8 (and why not?) Then you probably want to use the COLLATE command:
http://dev.mysql.com/doc/refman/5.0/en/charset-collate.html
SELECT *
FROM t1
WHERE _latin1 'Müller' COLLATE latin1_german2_ci = k;
SELECT *
FROM t1
WHERE k LIKE _latin1 'Müller' COLLATE latin1_german2_ci;
Also, you can apparently use the 'SET NAMES' command to alter the comparisons:
MySQL diacritic insensitive search (spanish accents)
Collation is the set of rules your DB is using to compare values. "all" you have to do is choose the right collation for your application. That said, #Danack57 above already gave you that piece of information.
I have a mysql table, I made it in latin1 style and it is all that way. How can I make a table that is all latin1 except one column, which i need to be able to accept chinese characters?
Also, Whats the best structure for a column with chinese characters?
alter table your_table
modify column
chinese_column varchar(255) collate utf8_general_ci; <-- or any relevant collate
details can be found here