mysql对已有表分区

CREATE TABLE orders (
    order_id INT AUTO_INCREMENT,
    order_date DATE,
    customer_id INT,
    total_amount DECIMAL(10, 2),
    PRIMARY KEY (order_id)
);

ALTER TABLE orders
PARTITION BY RANGE (YEAR(order_date)) (
    PARTITION p0 VALUES LESS THAN (2010),
    PARTITION p1 VALUES LESS THAN (2015),
    PARTITION p2 VALUES LESS THAN (2020),
    PARTITION p3 VALUES LESS THAN MAXVALUE
);

-- 创建分区表
ALTER TABLE orders
PARTITION BY RANGE (YEAR(order_date)) (
    PARTITION p0 VALUES LESS THAN (2010),
    PARTITION p1 VALUES LESS THAN (2015),
    PARTITION p2 VALUES LESS THAN (2020),
    PARTITION p3 VALUES LESS THAN MAXVALUE
);

-- 查询分区表
SELECT * FROM orders PARTITION (p2);

-- 添加新分区
ALTER TABLE orders ADD PARTITION (
    PARTITION p4 VALUES LESS THAN (2025)
);

-- 删除分区
ALTER TABLE orders DROP PARTITION p0;