error:flask,sqlalchemy.exc.OperationalError: (MySQLdb._exceptions.OperationalError) (1071, 'Specified key was too long; max key length is 767 bytes')
分析：數據庫類型字符不對（默認ｌａｔｉｎ）
解決：ALTER DATABASE `databasename` CHARACTER SET utf8;
flask建表遇到的錯誤： 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 建索引時 Specified key was too long; max key length is 767 bytes 錯誤的處理
索引長度過長 ERROR 1071 (42000): Specified key was too long; max key length is 767 bytes
MySQL 報錯：[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
導入sql文件報錯：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執行創建表的命令，遇到異常com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Specified key was too long; max key length is 767 bytes