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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,
`date_deb` date NOT NULL,
`date_fin` date NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `test` (`date_deb`,`date_fin`) values
('2016-01-10', '2016-01-15'),
('2016-01-12', '2016-01-16'),
('2016-01-21', '2016-02-10'),
('2016-01-31', '2016-02-15')
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select * from test
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+----+------------+------------+
| id | date_deb | date_fin |
+----+------------+------------+
| 1 | 2016-01-10 | 2016-01-15 |
| 2 | 2016-01-12 | 2016-01-16 |
| 3 | 2016-01-21 | 2016-02-10 |
| 4 | 2016-01-31 | 2016-02-15 |
+----+------------+------------+
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select datediff(LEAST(date_fin, '2016-01-31'), date_sub(date_deb, interval 1 day)) as 'calc' from test
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+------+
| calc |
+------+
| 6 |
| 5 |
| 11 |
| 1 |
+------+
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select sum(datediff(LEAST(date_fin, '2016-01-31'), date_sub(date_deb, interval 1 day))) as 'calc' from test
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+------+
| calc |
+------+
| 23 |
+------+
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COMMIT
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SET AUTOCOMMIT = 1
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