我在Amazon RDS上使用MySQL 5.6.22（InnoDB）。我试图将所有表，列，连接和数据库字符集以及排序规则设置都设置为utf8mb4 /
utf8mb4_unicode_ci。在任何地方都没有字符集的情况下latin1，我找不到任何证据，但是当我执行以下代码时（通过node-
mysql或直接在Mac上的“ Sequel Pro”应用程序中）：

update MyTable m 
set m.Column8 = 1
where m.Column3 = 26 and m.Column4 = 76
collate utf8mb4_unicode_ci

我收到此错误消息：

COLLATION 'utf8mb4_unicode_ci' is not valid for CHARACTER SET 'latin1'

我找不到在配置中设置的 任何内容latin1。

输出show variables like "char%"：

character_set_client        utf8mb4
character_set_connection    utf8mb4
character_set_database      utf8mb4
character_set_filesystem    utf8mb4
character_set_results       utf8mb4
character_set_server        utf8mb4
character_set_system        utf8
character_sets_dir          /rdsdbbin/mysql-5.6.22.R1/share/charsets/

输出show variables like "collation%"：

collation_connection        utf8mb4_unicode_ci
collation_database          utf8mb4_unicode_ci
collation_server            utf8mb4_unicode_ci

MyTable的CREATE TABLE信息是：

CREATE TABLE `MyTable` (
  `Column1` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `Column2` varchar(12) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `Column3` bigint(20) unsigned NOT NULL,
  `Column4` bigint(20) unsigned NOT NULL,
  `Column5` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6),
  `Column6` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6),
  `Column7` varchar(112) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT '',
  `Column8` tinyint(1) unsigned NOT NULL,
  `Column9` decimal(16,14) DEFAULT NULL,
  `Column10` decimal(17,14) DEFAULT NULL,
  `Column11` bigint(20) unsigned DEFAULT NULL,
  `Column12` bigint(20) unsigned DEFAULT NULL,
  `Column13` timestamp(6) NULL DEFAULT NULL,
  `Column14` timestamp(6) NULL DEFAULT NULL,
  `Column15` tinyint(4) NOT NULL DEFAULT '1',
  `Column16` tinyint(4) NOT NULL DEFAULT '1',
  `Column17` varchar(15) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `Column18` varchar(200) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `Column19` bigint(20) unsigned DEFAULT NULL,
  PRIMARY KEY (`Column1`),
  KEY `IX_Reevues_Column3` (`Column3`),
  KEY `IX_Reevues_Column4` (`Column4`),
  KEY `IX_Reevues_Column6` (`Column6`),
  KEY `IX_Reevues_Column8` (`Column8`),
  KEY `IX_Reevues_Column2` (`Column2`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;