What is unknown collation 'utf8mb4_unicode-520-ci' and how to solve it? | Web Hosting Forum - Review - Community & Resources
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Решение проблемы “unknown collation utf8mb4 unicode 520 ci” при переносе WordPress на хостинг — Teletype
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How to fix #1273 | Unknown collation utf8mb4 unicode 520 ci on | PhpMyadmin problem solved - YouTube
MySQL - #1273 - Unknown collation: 'utf8mb4_unicode_520_ci' · Issue #1383 · Varying-Vagrant-Vagrants/VVV · GitHub
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Błąd 1273 (HY000) podczas importowania bazy danych MySQL, czyli nieznana metoda kodowania znaków | Webinsider - Internet widziany od środka ™
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character encoding - How to convert an entire MySQL database characterset and collation to UTF-8? - Stack Overflow
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Which encoding to choose in MySQL - utf8 or utf8mb4 (utf8mb4_general_ci, utf8mb4_unicode_ci or utf8mb4_0900_ai_ci). How do they differ, how are they decoded and possible errors - Eqsash
Importing database: Use mysql_version to avoid `Unknown collation: 'utf8mb4_0900_ai_ci'` · Issue #1902 · drud/ddev · GitHub
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