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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 `modele`
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CREATE TABLE `modele`
( `clef` smallint NOT NULL,
`nom` char(10) NOT NULL,
`val` decimal(5,2) NOT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `modele` (`clef`,`nom`,`val`) values
(2015, 'velo', 17.20),
(2015, 'guidon', 65.15),
(2015, 'pedale', 35.50),
(2015, 'cadre', 230.20),
(2016, 'velo', 17.20),
(2016, 'selle', 17.20),
(2017, 'velo', 17.20)
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select * from `modele`
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+------+--------+--------+
| clef | nom | val |
+------+--------+--------+
| 2015 | velo | 17.20 |
| 2015 | guidon | 65.15 |
| 2015 | pedale | 35.50 |
| 2015 | cadre | 230.20 |
| 2016 | velo | 17.20 |
| 2016 | selle | 17.20 |
| 2017 | velo | 17.20 |
+------+--------+--------+
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drop view if exists `vue_1`
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create view `vue_1` as
select t1.clef,
t1.nom,
any_value(t1.val) as val,
count(t1.nom) as rang
from modele as t1
left outer join modele as t2
on t2.clef = t1.clef
and t2.nom <= t1.nom
group by t1.clef, t1.nom
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select * from vue_1
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+------+--------+--------+------+
| clef | nom | val | rang |
+------+--------+--------+------+
| 2015 | cadre | 230.20 | 1 |
| 2015 | guidon | 65.15 | 2 |
| 2015 | pedale | 35.50 | 3 |
| 2015 | velo | 17.20 | 4 |
| 2016 | selle | 17.20 | 1 |
| 2016 | velo | 17.20 | 2 |
| 2017 | velo | 17.20 | 1 |
+------+--------+--------+------+
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drop view if exists `vue_2`
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create view `vue_2` as
select clef,
case when rang = 1 then nom else '' end as nom_1,
case when rang = 1 then val else '' end as val_1,
case when rang = 2 then nom else '' end as nom_2,
case when rang = 2 then val else '' end as val_2,
case when rang = 3 then nom else '' end as nom_3,
case when rang = 3 then val else '' end as val_3,
case when rang = 4 then nom else '' end as nom_4,
case when rang = 4 then val else '' end as val_4
from vue_1
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select * from vue_2
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+------+-------+--------+--------+-------+--------+-------+-------+-------+
| clef | nom_1 | val_1 | nom_2 | val_2 | nom_3 | val_3 | nom_4 | val_4 |
+------+-------+--------+--------+-------+--------+-------+-------+-------+
| 2015 | cadre | 230.20 | | | | | | |
| 2015 | | | guidon | 65.15 | | | | |
| 2015 | | | | | pedale | 35.50 | | |
| 2015 | | | | | | | velo | 17.20 |
| 2016 | selle | 17.20 | | | | | | |
| 2016 | | | velo | 17.20 | | | | |
| 2017 | velo | 17.20 | | | | | | |
+------+-------+--------+--------+-------+--------+-------+-------+-------+
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drop view if exists `vue_3`
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create view `vue_3` as
select clef,
max(nom_1) as nom_1,
max(val_1) as val_1,
max(nom_2) as nom_2,
max(val_2) as val_2,
max(nom_3) as nom_3,
max(val_3) as val_3,
max(nom_4) as nom_4,
max(val_4) as val_4
from vue_2
group by clef
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select * from vue_3
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+------+-------+--------+--------+-------+--------+-------+-------+-------+
| clef | nom_1 | val_1 | nom_2 | val_2 | nom_3 | val_3 | nom_4 | val_4 |
+------+-------+--------+--------+-------+--------+-------+-------+-------+
| 2015 | cadre | 230.20 | guidon | 65.15 | pedale | 35.50 | velo | 17.20 |
| 2016 | selle | 17.20 | velo | 17.20 | | | | |
| 2017 | velo | 17.20 | | | | | | |
+------+-------+--------+--------+-------+--------+-------+-------+-------+
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COMMIT
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SET AUTOCOMMIT = 1
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