I have a table in mysql. I want to change one of the columns to have utf8_bin as it's collate attribute.
I know the command to do for whole table is like:
ALTER TABLE temp CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin;
But how do I do it for individual columns?
Thanks for the help
It's right in the manual
Their example
ALTER TABLE t1 MODIFY
col1 VARCHAR(5)
CHARACTER SET latin1
COLLATE latin1_swedish_ci;
Related
i tried to insert arabic word in MySql and it got inserted and when i displayed it it was there
but there was a warning 3720
for context here is the table:
create table SIGHTS ( S_no int not null PRIMARY KEY, S_name Nvarchar(30) not null);
and here is the inserted value:
insert into SIGHTS values (1,(N'كهف الهكبة'));
so? is it safe to ignore the warning or what should i do with it ?
it seems like you have used the default CHARACTER SET "utf8mb4" and the COLLATE utf8mb4_0900_ai_ci when you create the database. for more information, check this link out
when you create the database using the default "create" statement, which is
CREATE DATABASE _dbase;
it will execute the following statement adding the default CHARACTER SET
CREATE DATABASE _dbase CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci;
change the CHARACTER SET to "utf8" and the COLLATE to "utf8_general_ci" or "utf8_unicode_ci", you need to use the following statements :
CREATE DATABASE _dbase CHARACTER SET utf8 COLLATE utf8_general_ci;
or
CREATE DATABASE _dbase CHARACTER SET utf8 COLLATE utf8_unicode_ci;
I need to change below collation to utf8_general_ci
You can use Alter table clause
ALTER TABLE `change_messages` CHANGE `message` `message` TEXT CHARSET utf8 COLLATE utf8_general_ci;
I have a table which some of its columns has collation of utf8_bin. But I need to change them to utf8_unicode_ci.
I know this query for do it:
ALTER TABLE `shn_sho_cities` CHANGE `city_name` `city_name` VARCHAR( 100 ) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL ;
but as I want change all columns which have utf8_bin instead of writing a query for each column.
Is there any way which I could do this?
The following code will generate the required queries to change your collations, to utf8mb4 with utf8mb4_unicode_ci
SELECT CONCAT('ALTER TABLE `', TABLE_NAME,'` CONVERT TO CHARACTER SET
utf8mb4 COLLATE utf8mb4_unicode_ci;') AS mySQL
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_SCHEMA= "YOU-DB-NAME"
AND TABLE_TYPE="BASE TABLE"
Here is quetions about adding comment to column for MySQL. Can this comment be utf-8? Also what encoding MySQL uses for these columns by default?
Default character set and collation is set when the database is created
CREATE DATABASE mydb
DEFAULT CHARACTER SET utf8
DEFAULT COLLATE utf8_general_ci;
You can modify character set on a specific column like this
ALTER TABLE t MODIFY col1 CHAR(50) CHARACTER SET utf8;
Ok, in the existing table,
CREATE TABLE tb(id int, `text` varchar(255) character set latin1 collate latin1_bin default NULL)ENGINE=InnoDB DEFAULT CHARSET=latin1
I want to make the text column to be utf8 and it supports Case Sensitive for select query
Suppose there is "ã" & "Ã" which is utf8 in the text column
id - text
1 - ã
2 - Ã
, and when user select * from tb where text='Ã'it should show record with id=2 only
Is this query the correct one
alter table tb modify column text varchar(255) character set utf8 collate utf8_general_ci default NULL
I have no idea what utf8_general_ci means? am i doing cortrectly?
This can be done by using the Alter Command.
Like ALTER TABLE urtable MODIFY col1 VARCHAR(50) CHARACTER SET utf8;
See column charset conversion here
this is the correct one
alter table tb modify text varchar(255) character set utf8 collate utf8_bin default NULL