1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116
| --------------
SET AUTOCOMMIT = 0
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--------------
START TRANSACTION
--------------
--------------
DROP DATABASE IF EXISTS `base`
--------------
--------------
CREATE DATABASE `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
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--------------
DROP TABLE IF EXISTS `action`
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--------------
CREATE TABLE IF NOT EXISTS `action`
( `id_action` integer unsigned not null auto_increment primary key,
`nom_action` varchar(255) not null
) engine=innoDB
default charset=latin1 collate=latin1_general_ci
row_format=compressed
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insert into `action` (`nom_action`) values
('toto'), ('titi')
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--------------
select * from action
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+-----------+------------+
| id_action | nom_action |
+-----------+------------+
| 1 | toto |
| 2 | titi |
+-----------+------------+
--------------
DROP TABLE IF EXISTS `histo`
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--------------
CREATE TABLE IF NOT EXISTS `histo`
( `id_histo` integer unsigned not null auto_increment primary key,
`id_action` integer unsigned not null,
`date_histo` date not null,
`val_histo` varchar(255) not null,
CONSTRAINT `FK_histo_action` FOREIGN KEY (`id_action`) REFERENCES `action` (`id_action`) ON DELETE CASCADE ON UPDATE CASCADE
) engine=innoDB
default charset=latin1 collate=latin1_general_ci
row_format=compressed
--------------
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insert into `histo` (`id_action`,`date_histo`,`val_histo`) values
(1, '2016-06-10', 50),
(2, '2016-06-11', 60),
(2, '2016-06-12', 80),
(1, '2016-06-13', 40)
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select * from histo
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+----------+-----------+------------+-----------+
| id_histo | id_action | date_histo | val_histo |
+----------+-----------+------------+-----------+
| 1 | 1 | 2016-06-10 | 50 |
| 2 | 2 | 2016-06-11 | 60 |
| 3 | 2 | 2016-06-12 | 80 |
| 4 | 1 | 2016-06-13 | 40 |
+----------+-----------+------------+-----------+
--------------
select a.nom_action,
h.date_histo,
h.val_histo
from histo as h
inner join action as a
on a.id_action = h.id_action
left outer join histo as z
on z.id_action = h.id_action
and z.date_histo > h.date_histo
where z.id_histo is null
order by a.nom_action desc
--------------
+------------+------------+-----------+
| nom_action | date_histo | val_histo |
+------------+------------+-----------+
| toto | 2016-06-13 | 40 |
| titi | 2016-06-12 | 80 |
+------------+------------+-----------+
--------------
COMMIT
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SET AUTOCOMMIT = 1
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