error:flask,sqlalchemy.exc.OperationalError: (MySQLdb._exceptions.OperationalError) (1071, 'Specified key was too long; max key length is 767 bytes')
分析：数据库类型字符不对（默认ｌａｔｉｎ）
解决：ALTER DATABASE `databasename` CHARACTER SET utf8;
flask建表遇到的错误： flask,sqlalchemy.exc.OperationalError: (MySQLdb._exceptions.OperationalError) (1071, 'Specified key was too long; max key length is 767 bytes')
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django.db.utils.OperationalError: (1071, 'Specified key was too long; max key length is 767 bytes')
django.db.utils.OperationalError: (1071, 'Specified key was too long; max key length is 767 bytes')；
MySQL 建索引时 Specified key was too long; max key length is 767 bytes 错误的处理
索引长度过长 ERROR 1071 (42000): Specified key was too long; max key length is 767 bytes
MySQL 报错：[Err] 1071 - Specified key was too long; max key length is 767 bytes
ERROR 1071 (42000): Specified key was too long; max key length is 767 bytes
导入sql文件报错：1071 Specified key was too long; max key length is 767 bytes
Specified key was too long; max key length is 767 bytes
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Specified key was too long; max key length is 767 bytes
在hive执行创建表的命令，遇到异常com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Specified key was too long; max key length is 767 bytes