SQLSTATE[42000]: Syntax error or access violation: 1253 COLLATION 'utf8mb4_unicode_ci' is not valid for CHARACTER SET 'binary'

对数据表更改，然后执行数据迁移命令php artisan migrate，之后报错如下：

 解决办法：

 参考：https://www.hellojava.com/a/68286.html

SQLSTATE[42000]: Syntax error or access violation: 1253 COLLATION 'utf8mb4_unicode_ci' is not valid for CHARACTER SET 'binary'

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