关于MySQL字符集问题：Specified key was too long; max key length is 767 bytes
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今天同步同事的数据库数据。出现了Specified key was too long; max key length is 767 bytes，错误，最后找到原因是因为
原因：MySQL的varchar主键只支持不超过768个字节 或者 768/2=384个双字节 或者 768/3=256个三字节的字段而 GBK是双字节的，UTF-8是三字节的。
我的数据库字符集为utf8,3字节，因此最低因为256；
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