MySQL8のutf8mb4におけるCollation比較
1. MySQLバージョン SELECT VERSION(); +-----------+ | VERSION() | +-----------+ | 8.0.20 | +-----------+ 2. デフォルトのCollation SHOW COLLATION WHERE COLLATION LIKE 'utf8mb4%' AND `default` = 'Yes'; +--------------------+---------+-----+---------+----------+---------+---------------+ | Collation | Charset | Id | Default | Compiled | Sortlen | Pad_attribute | +--------------------+---------+-----+---------+----------+---------+---------------+ | utf8mb4_0900_ai_ci | utf8mb4 |