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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` integer unsigned NOT NULL auto_increment primary key,
`date_depot` date NOT NULL,
`region` char(01) NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `test` (`date_depot`,`region`) values
('2019-01-01', 'A'),
('2019-01-02', 'B'),
('2019-01-03', 'A'),
('2019-01-04', 'C'),
('2019-01-05', 'B')
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select * from `test`
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+----+------------+--------+
| id | date_depot | region |
+----+------------+--------+
| 1 | 2019-01-01 | A |
| 2 | 2019-01-02 | B |
| 3 | 2019-01-03 | A |
| 4 | 2019-01-04 | C |
| 5 | 2019-01-05 | B |
+----+------------+--------+
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select *
from `test` as t1
where date_depot = ( select max(t2.date_depot)
from `test` as t2
where t2.region = t1.region
)
order by t1.date_depot desc
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+----+------------+--------+
| id | date_depot | region |
+----+------------+--------+
| 5 | 2019-01-05 | B |
| 4 | 2019-01-04 | C |
| 3 | 2019-01-03 | A |
+----+------------+--------+
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COMMIT
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