Partition

CREATE TABLE member (
    id INT NOT NULL AUTO_INCREMENT,
    age INT NOT NULL,
    cont VARCHAR(255) NOT NULL,
        PRIMARY KEY(id, age)
)
PARTITION BY range(age) (
    PARTITION p0 VALUES LESS THAN (10), -- 0~9
    PARTITION p1 VALUES LESS THAN (20), -- 10~19
    PARTITION p2 VALUES LESS THAN (30), -- 20~29
    PARTITION p3 VALUES LESS THAN (40), -- 30~39
    PARTITION p4 VALUES LESS THAN (MAXVALUE) -- over 40
);

ALTER table member
PARTITION BY RANGE(age) -- partition key must be primary key
    PARTITION p0 VALUES LESS THAN (10), -- 0~9
    PARTITION p1 VALUES LESS THAN (20), -- 10~19
    PARTITION p2 VALUES LESS THAN (30), -- 20~29
    PARTITION p3 VALUES LESS THAN (40), -- 30~39
    PARTITION p4 VALUES LESS THAN (MAXVALUE) -- over 40
);