请问建议数据库使用什么字符集呢?
SQL 查询:
CREATE TABLE `bbs_my_favourite` (
`id` INT( 10 ) UNSIGNED NOT NULL AUTO_INCREMENT ,
`created_at` TIMESTAMP NULL DEFAULT NULL ,
`updated_at` TIMESTAMP NULL DEFAULT NULL ,
`deleted_at` TIMESTAMP NULL DEFAULT NULL ,
`user_id` INT( 11 ) DEFAULT '0',
`thread_id` INT( 11 ) DEFAULT '0',
PRIMARY KEY ( `id` ) ,
KEY `idx_bbs_my_favourite_deleted_at` ( `deleted_at` )
) ENGINE = INNODB AUTO_INCREMENT =1 DEFAULT CHARSET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci;
MySQL 返回: 
#1273 - Unknown collation: 'utf8mb4_0900_ai_ci'