mysql 批量修改表字段的字符集和排序规则

查询数据库表的字段的字符集和排序规则和修正SQL，执行后复制修正SQL执行即可修改字符集和排序规则

SELECT
    TABLE_SCHEMA '数据库',
    TABLE_NAME '表',
    COLUMN_NAME '字段',
    CHARACTER_SET_NAME '原字符集',
    COLLATION_NAME '原排序规则',
    CONCAT( 'ALTER TABLE ', TABLE_SCHEMA, '.', TABLE_NAME, ' MODIFY COLUMN ', COLUMN_NAME, ' ', COLUMN_TYPE, ' CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;' ) '修正SQL' 
FROM
    information_schema.`COLUMNS` 
WHERE
    COLLATION_NAME RLIKE 'utf8' AND COLLATION_NAME != 'utf8mb4_general_ci' AND TABLE_SCHEMA='db_cbt';