问题描述: 表和数据是这样的 CREATE TABLE `your_table` ( `id` int(11) NOT NULL AUTO_INCREMENT, `A` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL, `B` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact; INSERT INTO `your_table` VALUES (1, 'a1',