探索mysql的分区

下面的表employees是根据store_id列值来进行分区的——用range来分区的

CREATE TABLE employees (
id INT NOT NULL,
fname VARCHAR(30),
lname VARCHAR(30),
hired DATE NOT NULL DEFAULT '1970-01-01',
separated DATE NOT NULL DEFAULT '9999-12-31',
job_code INT NOT NULL,
store_id INT NOT NULL
)
PARTITION BY RANGE (store_id) (
PARTITION p0 VALUES LESS THAN (6),
PARTITION p1 VALUES LESS THAN (11),
PARTITION p2 VALUES LESS THAN (16),  PARTITION p3 VALUES LESS THAN MAXVALUE );

CREATE TABLE employees (
id INT NOT NULL,
fname VARCHAR(30),
lname VARCHAR(30),
hired DATE NOT NULL DEFAULT '1970-01-01',
separated DATE NOT NULL DEFAULT '9999-12-31',
job_code INT,
store_id INT
)
PARTITION BY LIST(store_id) (
PARTITION pNorth VALUES IN (3,5,6,9,17),
PARTITION pEast VALUES IN (1,2,10,11,19,20),
PARTITION pWest VALUES IN (4,12,13,14,18),
PARTITION pCentral VALUES IN (7,8,15,16)
);

mysql> SELECT PARTITION_NAME,TABLE_ROWS -> FROM INFORMATION_SCHEMA.PARTITIONS -> WHERE TABLE_NAME = 'employees';
+----------------+------------+
| PARTITION_NAME | TABLE_ROWS |
p0               1
p1 4

p2 0

p3 0

下面这条语句返回的是p1分区中的所有记录：

SELECT * FROM employees PARTITION (p1);