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SET AUTOCOMMIT = 0
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START TRANSACTION
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DROP DATABASE IF EXISTS `base`
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CREATE DATABASE IF NOT EXISTS `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
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DROP TABLE IF EXISTS `test`
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CREATE TABLE `test`
( `id` timestamp(6) NOT NULL,
`val` tinyint unsigned NOT NULL,
`lib` varchar(255) NOT NULL,
`year` smallint unsigned GENERATED ALWAYS AS (year(id)) stored,
`month` tinyint unsigned GENERATED ALWAYS AS (month(id)) stored,
PRIMARY KEY (`id`,`year`,`month`),
INDEX `IDX` (`year`,`month`,`val`)
) ENGINE=Innodb
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
PARTITION BY RANGE COLUMNS (`year`,`month`)
(
PARTITION p2017s01 values less than (2017,02),
PARTITION p2017s02 values less than (2017,03),
PARTITION p2017s03 values less than (2017,04),
PARTITION p2017s04 values less than (2017,05),
PARTITION p2017s05 values less than (2017,06),
PARTITION p2017s06 values less than (2017,07),
PARTITION p2017s07 values less than (2017,08),
PARTITION p2017s08 values less than (maxvalue,maxvalue)
)
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commit
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insert into `test` (`id`,`val`,`lib`) values
('2017-01-01- 15:00:00.000001', 05,'un'), ('2017-01-01- 15:00:00.000002',07,'deux'), ('2017-01-01- 15:00:00.000003',06,'trois'),
('2017-02-01- 15:00:00.000001', 07,'quatre'), ('2017-02-01- 15:00:00.000002',06,'cinq'), ('2017-02-01- 15:00:00.000003',05,'six'),
('2017-03-01- 15:00:00.000001', 06,'sept'), ('2017-03-01- 15:00:00.000002',05,'huit'), ('2017-03-01- 15:00:00.000003',07,'neuf'),
('2017-04-01- 15:00:00.000001', 05,'dix'), ('2017-04-01- 15:00:00.000002',07,'onze'), ('2017-04-01- 15:00:00.000003',06,'douze'),
('2017-05-01- 15:00:00.000001', 07,'treize'), ('2017-05-01- 15:00:00.000002',06,'quatorze'), ('2017-05-01- 15:00:00.000003',05,'quinze'),
('2017-06-01- 15:00:00.000001', 06,'seize'), ('2017-06-01- 15:00:00.000002',05,'dix-sept'), ('2017-06-01- 15:00:00.000003',07,'dix-huit'),
('2017-07-01- 15:00:00.000001', 05,'dix_neuf'), ('2017-07-01- 15:00:00.000002',07,'vingt'), ('2017-07-01- 15:00:00.000003',06,'vingt-et-un'),
('2017-08-01- 15:00:00.000001', 07,'vingt-deux'),('2017-08-01- 15:00:00.000002',06,'vingt-trois'),('2017-08-01- 15:00:00.000003',05,'vingt-quatre')
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select * from `test`
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+----------------------------+-----+--------------+------+-------+
| id | val | lib | year | month |
+----------------------------+-----+--------------+------+-------+
| 2017-01-01 15:00:00.000001 | 5 | un | 2017 | 1 |
| 2017-01-01 15:00:00.000002 | 7 | deux | 2017 | 1 |
| 2017-01-01 15:00:00.000003 | 6 | trois | 2017 | 1 |
| 2017-02-01 15:00:00.000001 | 7 | quatre | 2017 | 2 |
| 2017-02-01 15:00:00.000002 | 6 | cinq | 2017 | 2 |
| 2017-02-01 15:00:00.000003 | 5 | six | 2017 | 2 |
| 2017-03-01 15:00:00.000001 | 6 | sept | 2017 | 3 |
| 2017-03-01 15:00:00.000002 | 5 | huit | 2017 | 3 |
| 2017-03-01 15:00:00.000003 | 7 | neuf | 2017 | 3 |
| 2017-04-01 15:00:00.000001 | 5 | dix | 2017 | 4 |
| 2017-04-01 15:00:00.000002 | 7 | onze | 2017 | 4 |
| 2017-04-01 15:00:00.000003 | 6 | douze | 2017 | 4 |
| 2017-05-01 15:00:00.000001 | 7 | treize | 2017 | 5 |
| 2017-05-01 15:00:00.000002 | 6 | quatorze | 2017 | 5 |
| 2017-05-01 15:00:00.000003 | 5 | quinze | 2017 | 5 |
| 2017-06-01 15:00:00.000001 | 6 | seize | 2017 | 6 |
| 2017-06-01 15:00:00.000002 | 5 | dix-sept | 2017 | 6 |
| 2017-06-01 15:00:00.000003 | 7 | dix-huit | 2017 | 6 |
| 2017-07-01 15:00:00.000001 | 5 | dix_neuf | 2017 | 7 |
| 2017-07-01 15:00:00.000002 | 7 | vingt | 2017 | 7 |
| 2017-07-01 15:00:00.000003 | 6 | vingt-et-un | 2017 | 7 |
| 2017-08-01 15:00:00.000001 | 7 | vingt-deux | 2017 | 8 |
| 2017-08-01 15:00:00.000002 | 6 | vingt-trois | 2017 | 8 |
| 2017-08-01 15:00:00.000003 | 5 | vingt-quatre | 2017 | 8 |
+----------------------------+-----+--------------+------+-------+
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SELECT PARTITION_NAME, SUBPARTITION_NAME, TABLE_ROWS
FROM INFORMATION_SCHEMA.PARTITIONS
WHERE TABLE_NAME = 'test'
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+----------------+-------------------+------------+
| PARTITION_NAME | SUBPARTITION_NAME | TABLE_ROWS |
+----------------+-------------------+------------+
| p2017s01 | NULL | 3 |
| p2017s02 | NULL | 3 |
| p2017s03 | NULL | 3 |
| p2017s04 | NULL | 3 |
| p2017s05 | NULL | 3 |
| p2017s06 | NULL | 3 |
| p2017s07 | NULL | 3 |
| p2017s08 | NULL | 3 |
+----------------+-------------------+------------+
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explain select *
from `test`
where `year` = 2017
and `month` = 5
and `val` = 6
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+----+-------------+-------+------------+------+---------------+------+---------+-------------------+------+----------+-------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+-------+------------+------+---------------+------+---------+-------------------+------+----------+-------+
| 1 | SIMPLE | test | p2017s05 | ref | IDX | IDX | 4 | const,const,const | 1 | 100.00 | NULL |
+----+-------------+-------+------------+------+---------------+------+---------+-------------------+------+----------+-------+
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select *
from `test`
where `year` = 2017
and `month` = 5
and `val` = 6
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+----------------------------+-----+----------+------+-------+
| id | val | lib | year | month |
+----------------------------+-----+----------+------+-------+
| 2017-05-01 15:00:00.000002 | 6 | quatorze | 2017 | 5 |
+----------------------------+-----+----------+------+-------+
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COMMIT
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SET AUTOCOMMIT = 1
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