1. mysql 5.7 sql_model = only_full_group_by 问题
引用: https://www.osyunwei.com/?p=10120
2. mysql utf8mb4_unicode_ci utf8mb4_unicode_520_ci
引用: https://stackoverflow.com/questions/37307146/difference-between-utf8mb4-unicode-ci-and-utf8mb4-unicode-520-ci-collations-in-m
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引用: https://www.cnblogs.com/jeakeven/p/5402095.html