MySQL partition table is classified by month

create table normal_table(id int primary key, no int)

normal_table.ibd  

create table partition_table(id int AUTO_INCREMENT, create_date date, name varchar(10), 
primary key(id, create_date)) ENGINE=INNODB DEFAULT CHARSET=utf8 
partition by range(month(create_date))(
partition quarter1 values ​​less than(4),
partition quarter2 values ​​less than(7),
partition quarter3 values ​​less than(10),
partition quarter4 values ​​less than(13)
);

partition_table#p#quarter1.ibd  
partition_table#p#quarter2.ibd  
partition_table#p#quarter3.ibd  
partition_table#p#quarter4.ibd

insert into partition_table(create_date, name) values("2021-01-25", "tom1");
insert into partition_table(create_date, name) values("2021-02-25", "tom2");
insert into partition_table(create_date, name) values("2021-03-25", "tom3");
insert into partition_table(create_date, name) values("2021-04-25", "tom4");
insert into partition_table(create_date, name) values("2021-05-25", "tom5");
insert into partition_table(create_date, name) values("2021-06-25", "tom6");
insert into partition_table(create_date, name) values("2021-07-25", "tom7");
insert into partition_table(create_date, name) values("2021-08-25", "tom8");
insert into partition_table(create_date, name) values("2021-09-25", "tom9");
insert into partition_table(create_date, name) values("2021-10-25", "tom10");
insert into partition_table(create_date, name) values("2021-11-25", "tom11");
insert into partition_table(create_date, name) values("2021-12-25", "tom12");

select count(*) from partition_table;
> 12

 
Query the data of the second partition (second quarter):
select * from partition_table PARTITION(quarter2);

4 2021-04-25 tom4
5 2021-05-25 tom5
6 2021-06-25 tom6

DELIMITER $$
DROP PROCEDURE IF EXISTS auto_create_partition$$
CREATE PROCEDURE `auto_create_partition`(IN `table_name` varchar(64))
BEGIN
   SET @next_month:=CONCAT(date_format(date_add(now(),interval 2 month),'%Y%m'),'01');
   SET @SQL = CONCAT( 'ALTER TABLE `', table_name, '`',
     ' ADD PARTITION (PARTITION p', @next_month, " VALUES LESS THAN (TO_DAYS(",
       @next_month ,")) );" );
   PREPARE STMT FROM @SQL;
   EXECUTE STMT;
   DEALLOCATE PREPARE STMT;
END$$

DROP PROCEDURE IF EXISTS auto_del_partition$$
CREATE PROCEDURE `auto_del_partition`(IN `table_name` varchar(64), IN `reserved_month` int)
BEGIN
 DECLARE v_finished INTEGER DEFAULT 0;
 DECLARE v_part_name varchar(100) DEFAULT "";
 DECLARE part_cursor CURSOR FOR 
  select partition_name from information_schema.partitions where table_schema = schema()
   and table_name=@table_name and partition_description < TO_DAYS(CONCAT(date_format(date_sub(now(),interval reserved_month month),'%Y%m'),'01'));
 DECLARE continue handler FOR 
  NOT FOUND SET v_finished = TRUE;
 OPEN part_cursor;
read_loop: LOOP
 FETCH part_cursor INTO v_part_name;
 if v_finished = 1 then
  leave read_loop;
 end if;
 SET @SQL = CONCAT( 'ALTER TABLE `', table_name, '` DROP PARTITION ', v_part_name, ";" );
 PREPARE STMT FROM @SQL;
 EXECUTE STMT;
 DEALLOCATE PREPARE STMT;
 END LOOP;
 CLOSE part_cursor;
END$$

DELIMITER ;

-- Assume there is a table called records, set the partition condition to partition by month by end_time DROP TABLE IF EXISTS `records`;
CREATE TABLE `records` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `start_time` datetime NOT NULL,
  `end_time` datetime NOT NULL,
  `memo` varchar(128) CHARACTER SET utf8mb4 NOT NULL,
  PRIMARY KEY (`id`,`end_time`)
) 
PARTITION BY RANGE (TO_DAYS(end_time))(
 PARTITION p20200801 VALUES LESS THAN ( TO_DAYS('20200801'))
);

DROP EVENT IF EXISTS `records_auto_partition`;

-- Create an Event that executes once a month and saves up to 6 months of data DELIMITER $$
CREATE EVENT `records_auto_partition`
ON SCHEDULE EVERY 1 MONTH ON COMPLETION PRESERVE
ENABLE
DO
BEGIN
call auto_create_partition('records');
call auto_del_partition('records',6);
END$$
DELIMITER ;