建表报错：Please consider using UTF8MB4 in order to be unambiguous

14:20:34 create table login_record ( userid int not null, time date default null )engine=innodb default charset=utf8 0 row(s) affected, 1 warning(s): 3719 ‘utf8’ is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous. 0.109 sec

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