----將hash 分割槽修改為range 分割槽，並刪除一個分割槽
mysql> ALTER TABLE orders_range  DROP PARTITION p0;
ERROR 1512 (HY000): DROP PARTITION can only be used on RANGE/LIST partitions


mysql> show create table orders_range;
+-------------- 
| Table        | Create Table                                                                                                
| orders_range | CREATE TABLE `orders_range` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `customer_surname` varchar(30) DEFAULT NULL,
  `store_id` int(11) DEFAULT NULL,
  `salesperson_id` int(11) DEFAULT NULL,
  `order_date` date DEFAULT NULL,
  `note` varchar(500) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
/*!50100 PARTITION BY HASH (id) PARTITIONS 4 */ |

+-------------- 
1 row in set (0.00 sec)


mysql> ALTER TABLE orders_range  PARTITION BY RANGE(id) PARTITIONS 4;
ERROR 1492 (HY000): For RANGE partitions each partition must be defined
 
mysql> ALTER TABLE orders_range  PARTITION BY RANGE(id) PARTITIONS 5
    -> (
    ->  PARTITION p0 VALUES LESS THAN(10000),
    ->  PARTITION p1 VALUES LESS THAN(20000),
    ->  PARTITION p2 VALUES LESS THAN(30000),
    ->  PARTITION p3 VALUES LESS THAN(40000),
    ->  PARTITION p4 VALUES LESS THAN(50000)
    ->  );
Query OK, 0 rows affected (0.13 sec)
Records: 0  Duplicates: 0  Warnings: 0


mysql> show create table orders_range;
+---------------+
| Table        | Create Table                                                                            
| orders_range | CREATE TABLE `orders_range` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `customer_surname` varchar(30) DEFAULT NULL,
  `store_id` int(11) DEFAULT NULL,
  `salesperson_id` int(11) DEFAULT NULL,
  `order_date` date DEFAULT NULL,
  `note` varchar(500) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
/*!50100 PARTITION BY RANGE (id)
(PARTITION p0 VALUES LESS THAN (10000) ENGINE = InnoDB,
 PARTITION p1 VALUES LESS THAN (20000) ENGINE = InnoDB,
 PARTITION p2 VALUES LESS THAN (30000) ENGINE = InnoDB,
 PARTITION p3 VALUES LESS THAN (40000) ENGINE = InnoDB,
 PARTITION p4 VALUES LESS THAN (50000) ENGINE = InnoDB)


1 row in set (0.00 sec)


mysql> ALTER TABLE orders_range  DROP PARTITION p0;
Query OK, 0 rows affected (0.05 sec)
Records: 0  Duplicates: 0  Warnings: 0


mysql> show create table orders_range\G
*************************** 1. row ***************************
       Table: orders_range
Create Table: CREATE TABLE `orders_range` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `customer_surname` varchar(30) DEFAULT NULL,
  `store_id` int(11) DEFAULT NULL,
  `salesperson_id` int(11) DEFAULT NULL,
  `order_date` date DEFAULT NULL,
  `note` varchar(500) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
/*!50100 PARTITION BY RANGE (id)
(PARTITION p1 VALUES LESS THAN (20000) ENGINE = InnoDB,
 PARTITION p2 VALUES LESS THAN (30000) ENGINE = InnoDB,
 PARTITION p3 VALUES LESS THAN (40000) ENGINE = InnoDB,
 PARTITION p4 VALUES LESS THAN (50000) ENGINE = InnoDB) */
1 row in set (0.00 sec)