How to eliminate the character set and sorting rules specially set for fields in MySQL tables?

Hope the column is in line with the table

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Other answers 1：

Reassign the field character set ( Collation default )

CREATE TABLE `t1` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `serial_no` varchar(50) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;alter table t1 modify `serial_no` varchar(50) CHARACTER SET utf8mb4 NOT NULL;show create table t1;/*CREATE TABLE `t1` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `serial_no` varchar(50) NOT NULL,  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4*/

Other answers 2：

mysql There are statements that can reassign the full table character set .

  

   CREATE TABLE `t1` ( `id` int(11) NOT NULL AUTO_INCREMENT, `serial_no` varchar(50) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
  

Execute statement ：

  

   ALTER TABLE t1 CONVERT TO CHARACTER SET utf8mb4;
  

CREATE TABLE t1 (
id int NOT NULL AUTO_INCREMENT,
serial_no varchar(50) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci

Introduction to official documents
To change the table default character set and all character columns (CHAR, VARCHAR, TEXT) to a new character set, use a statement like this:

ALTER TABLE tbl_name CONVERT TO CHARACTER SET charset_name;