MySQL 8.0 Collations: Migrating from older collations
From MySQL 8.0, utf8mb4 is the default character set, and the default collation for utf8mb4 is utf8mb4_0900_ai_ci. MySQL 8.0 is also coming with a whole new set of Unicode collations for the utf8mb4 character set.
This will allow use of the complete Unicode 9.0.0 character set in MySQL, and for new applications this is great news.…
Source: MySQL 8.0 Collations: Migrating from older collations
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