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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 `job`
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create table `job` (
`id` smallint unsigned NOT NULL AUTO_INCREMENT PRIMARY KEY,
`lib` char(10) NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `job` (`lib`) values ('job_1'),('job_2'),('job_3'),('job_4')
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select * from job
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+----+-------+
| id | lib |
+----+-------+
| 1 | job_1 |
| 2 | job_2 |
| 3 | job_3 |
| 4 | job_4 |
+----+-------+
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commit
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DROP TABLE IF EXISTS `test`
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create table `test` (
`id` int unsigned NOT NULL AUTO_INCREMENT PRIMARY KEY,
`job_id` smallint unsigned NOT NULL,
`val` char(10) NOT NULL,
CONSTRAINT `FK_01` FOREIGN KEY (`job_id`) REFERENCES `job` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `test` (`job_id`,`val`) values
(1, 'rouge'),(1, 'vert'),(1, 'rouge'),(1, 'vert'),
(2, 'bleu'),(2, 'noir'),(2, 'rose'),
(3, 'violet'),(3, 'marron')
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select * from test
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+----+--------+--------+
| id | job_id | val |
+----+--------+--------+
| 1 | 1 | rouge |
| 2 | 1 | vert |
| 3 | 1 | rouge |
| 4 | 1 | vert |
| 5 | 2 | bleu |
| 6 | 2 | noir |
| 7 | 2 | rose |
| 8 | 3 | violet |
| 9 | 3 | marron |
+----+--------+--------+
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select t1.lib, count(t2.job_id)
from job as t1
inner join test as t2
on (t2.job_id = t1.id)
and (t1.id in (1,3,4))
group by t1.lib
order by t1.lib desc
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+-------+------------------+
| lib | count(t2.job_id) |
+-------+------------------+
| job_3 | 2 |
| job_1 | 4 |
+-------+------------------+
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select t1.lib, count(t2.job_id)
from job as t1
left outer join test as t2
on (t2.job_id = t1.id)
and (t1.id in (1,3,4))
where t1.id in (1,3,4)
group by t1.lib
order by t1.lib desc
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+-------+------------------+
| lib | count(t2.job_id) |
+-------+------------------+
| job_4 | 0 |
| job_3 | 2 |
| job_1 | 4 |
+-------+------------------+
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COMMIT
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SET AUTOCOMMIT = 1
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