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

Question

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", "warrior" or "WARRIOR", and not "WÂRRÎOR" "Wârrîor" etc.

I found a partial solution, by changing the Charset to "utf8mb4" and the Collation to "utf8mb4_bin", now it seems accent sensitive, it differentiates "Wârrîor" from "Warrior", but it's also case sensitive, so "Warrior" is different than "WARRIOR" which is not what I want.

I tried a different collations but I couldn't get one to do what exactly what I want. Any ideas ?

Below is a screenshot of the different Collations available to me in the "utf8mb4" Charset :

Answer 1

Note that _bin means case and accent sensitive, in your case you should't use utf8mb4_bin.

You could use:

utf8mb4_0900_as_ci

as means accent sensitive, and ci means case insensitive

Demo:

CREATE TABLE t (
s1 VARCHAR(15) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_as_ci
);

insert into t values
('WÂRRÎOR'),
('Warrior'),
('warrior'),
('WARRIOR'),
('Wârrîor');

SELECT * 
FROM t 
WHERE s1 = "Warrior";

Result:

s1
Warrior
warrior
WARRIOR

Answer 2

• _bin -- accent sensitive and case sensitive
• _as_ci (MySQL 8.0 only) -- accent sensitive and case insensitive
• _ci -- accent insensitive and case insensitive

This lets you see what will compare equal and what won't:

• MySQL through 5.7, plus MariaDB with utf8 or utf8mb4 -- http://mysql.rjweb.org/utf8_collations.html
• MySQL 8.0 -- utf8mb4 -- http://mysql.rjweb.org/utf8mb4_collations.html

(Caveat: Those were taken from specific versions; the available collations do change, but the collations don't change.)

Most, maybe not all, _ci and _ai_ci collations will treat "Wârrîor" = "Warrior"

All _ci or _ai_ci collations will treat "WARRIOR" = "Warrior"