在本项目中,你将学习如何修改 MySQL 数据库中 countrylanguage 表的主键。初始主键仅基于 CountryCode 列,但为了更好地组织数据,你将使用 CountryCode 和 Language 列创建一个复合主键。
💡 本教程由 AI 辅助翻译自英文原版。如需查看原文,您可以 切换至英文原版
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