mysqldump 导出提示Couldn't execute SELECT COLUMN_NAME...

mysqldump命令：html 　　导出数据库：mysqldump -h ip -u root -p dbname > db.sql;mysql 　　导出数据库中的某个表：mysqldump -h ip -u root -p dbname tablename > tablename.sql;sql 错误提示：数据库 　　mysqldump: Couldn't execute 'SELECT CO

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