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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 `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,
`datedeb` datetime NOT NULL,
`datefin` datetime NOT NULL,
`reservation` varchar(255) NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `test` (`datedeb`,`datefin`,`reservation`) values
('2018-04-20 00:00:00','2018-04-20 08:00:00','Réservation 1'),
('2018-04-20 12:00:00','2018-04-20 14:00:00','Réservation 2'),
('2018-04-20 18:00:00','2018-04-21 00:00:00','Réservation 3')
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select * from `test` order by datedeb
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+----+---------------------+---------------------+---------------+
| id | datedeb | datefin | reservation |
+----+---------------------+---------------------+---------------+
| 1 | 2018-04-20 00:00:00 | 2018-04-20 08:00:00 | Réservation 1 |
| 2 | 2018-04-20 12:00:00 | 2018-04-20 14:00:00 | Réservation 2 |
| 3 | 2018-04-20 18:00:00 | 2018-04-21 00:00:00 | Réservation 3 |
+----+---------------------+---------------------+---------------+
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insert into `test` (`datedeb`,`datefin`,`reservation`)
select *
from ( select '2018-04-20 08:00:00' as datedeb,
'2018-04-20 12:00:00' as datefin,
'Réservation A !' as reservatin
from dual
union
select '2018-04-20 14:00:00' as datedeb,
'2018-04-20 19:00:00' as datefin,
'Réservation B !' as reservatin
from dual
) as x
where not exists ( select 1
from `test` as t
where t.datedeb < x.datefin
and t.datefin > x.datedeb
)
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select * from `test`
order by datedeb
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+----+---------------------+---------------------+-----------------+
| id | datedeb | datefin | reservation |
+----+---------------------+---------------------+-----------------+
| 1 | 2018-04-20 00:00:00 | 2018-04-20 08:00:00 | Réservation 1 |
| 4 | 2018-04-20 08:00:00 | 2018-04-20 12:00:00 | Réservation A ! |
| 2 | 2018-04-20 12:00:00 | 2018-04-20 14:00:00 | Réservation 2 |
| 3 | 2018-04-20 18:00:00 | 2018-04-21 00:00:00 | Réservation 3 |
+----+---------------------+---------------------+-----------------+
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COMMIT
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SET AUTOCOMMIT = 1
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