MySQL: ERROR 1071 : Specified key was too long;...
Specified key was too long; max key length is 767 bytes 索引
设置惟一索引的时候，出现的问题。varchar type的字段会有这个问题。 ci
解决方式：varchar type的字段长度不超过767bytes便可。 im
例如UTF-8的表内，一个字符最大占三个bytes，因此不超过varchar(255)便可。(GBK单字符最大占两个bytes) img
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