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MySQL]エラー「1253 COLLATION 'utf8_unicode_ci' is not valid for CHARACTER SET 'utf8mb4'」が出たとき | akamist blog
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Knowledge Must Be Shared!Fixing MySQL Error : Unknown collation: ' utf8mb4_unicode_ci': sanjeeve.com
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Unknown collation: 'utf8mb4_unicode_ci'【MySQL】
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Fix Unknown collation utf8mb4_unicode_ci [WP Migration] - Techglimpse
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