MySQL Returning 'ずる' When Searching for 'する' (Japanese) - mysql

Question

I have a database with Japanese words. I'm stumped because this query:
SELECT japanese
FROM my_table
where japanese = 'する'
returns two results:
ずる
する
I tried to look in the documentation but can't figure out what's going on or how to correct it. Here's some of the information about my setup using the queries recommended in the documentation:
SELECT CHARACTER_SET_NAME, DESCRIPTION
FROM INFORMATION_SCHEMA.CHARACTER_SETS
WHERE DESCRIPTION LIKE '%Japanese%'
ORDER BY CHARACTER_SET_NAME;
Returns:
'CHARACTER_SET_NAME','DESCRIPTION'
'cp932', 'SJIS for Windows Japanese'
'eucjpms', 'UJIS for Windows Japanese'
'sjis', 'Shift-JIS Japanese'
'ujis', 'EUC-JP Japanese'
And the following query:
SHOW VARIABLES LIKE 'char%'
Returns:
character_set_client utf8mb4
character_set_connection utf8mb4
character_set_database utf8mb4
character_set_filesystem binary
character_set_results utf8mb4
character_set_server utf8mb4
character_set_system utf8
And this really gets beyond my skill set. If someone can point me in the right direction that would be a big help.
Thank you.

Answer 1

You should use accent sensitive collation:
SELECT japanese
FROM my_table
where japanese = 'する' COLLATE utf8mb4_ja_0900_as_cs;
-- alternatively binary collation: COLLATE utf8mb4_bin
db<>fiddle demo
Introducing as_cs collations:
In MySQL 8.0.0 we improved our character set support with the addition of new accent and case insensitive (ai_ci) collations. In MySQL 8.0.1 the corresponding accent and case sensitive collations (as_cs) have also been added, as well as a Japanese collation