回答編集履歴
3
追記
answer
CHANGED
|
@@ -56,4 +56,59 @@
|
|
|
56
56
|
LEFT JOIN abilities a ON m.id=a.member_id
|
|
57
57
|
LEFT JOIN spec s ON a.spec_id = s.id
|
|
58
58
|
GROUP BY m.id
|
|
59
|
+
```
|
|
60
|
+
|
|
61
|
+
#テーブル定義（改）
|
|
62
|
+
|
|
63
|
+
優先順位の概念を追加
|
|
64
|
+
本来、正規化して以下のようにすべきかと思います。
|
|
65
|
+
|
|
66
|
+
```sql
|
|
67
|
+
CREATE TABLE `abilities` (
|
|
68
|
+
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
|
|
69
|
+
`member_id` int(11) DEFAULT NULL,
|
|
70
|
+
`spec_id` int(11) DEFAULT NULL,
|
|
71
|
+
`priority` int(11) DEFAULT NULL,
|
|
72
|
+
PRIMARY KEY (`id`)
|
|
73
|
+
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8mb4;
|
|
74
|
+
|
|
75
|
+
SELECT
|
|
76
|
+
m.id
|
|
77
|
+
, m.name
|
|
78
|
+
, group_concat(s.spec ORDER BY a.priority) AS specs
|
|
79
|
+
FROM member m
|
|
80
|
+
LEFT JOIN abilities a ON m.id = a.member_id
|
|
81
|
+
LEFT JOIN spec s ON a.spec_id = s.id
|
|
82
|
+
GROUP BY m.id
|
|
83
|
+
```
|
|
84
|
+
|
|
85
|
+
#事情を考慮した取得例
|
|
86
|
+
|
|
87
|
+
```sql
|
|
88
|
+
SELECT
|
|
89
|
+
a.name
|
|
90
|
+
, sp1.spec as spec1
|
|
91
|
+
, sp2.spec as spec2
|
|
92
|
+
, sp3.spec as spec3
|
|
93
|
+
, sp4.spec as spec4
|
|
94
|
+
, sp5.spec as spec5
|
|
95
|
+
, sp6.spec as spec6
|
|
96
|
+
, sp7.spec as spec7
|
|
97
|
+
, sp8.spec as spec8
|
|
98
|
+
, sp9.spec as spec9
|
|
99
|
+
, sp10.spec as spec10
|
|
100
|
+
FROM `member` AS a
|
|
101
|
+
LEFT JOIN `ability` AS b ON b.`id` = a.`ability_id`
|
|
102
|
+
LEFT JOIN `spec` AS sp1 ON sp1.`id` = b.`spec1`
|
|
103
|
+
LEFT JOIN `spec` AS sp2 ON sp2.`id` = b.`spec2`
|
|
104
|
+
LEFT JOIN `spec` AS sp3 ON sp3.`id` = b.`spec3`
|
|
105
|
+
LEFT JOIN `spec` AS sp4 ON sp4.`id` = b.`spec4`
|
|
106
|
+
LEFT JOIN `spec` AS sp5 ON sp5.`id` = b.`spec5`
|
|
107
|
+
LEFT JOIN `spec` AS sp6 ON sp6.`id` = b.`spec6`
|
|
108
|
+
LEFT JOIN `spec` AS sp7 ON sp7.`id` = b.`spec7`
|
|
109
|
+
LEFT JOIN `spec` AS sp8 ON sp8.`id` = b.`spec8`
|
|
110
|
+
LEFT JOIN `spec` AS sp9 ON sp9.`id` = b.`spec9`
|
|
111
|
+
LEFT JOIN `spec` AS sp10 ON sp10.`id` = b.`spec10`
|
|
112
|
+
WHERE `id` = 1
|
|
113
|
+
group by a.id
|
|
59
114
|
```
|
2
追記
answer
CHANGED
|
@@ -45,4 +45,15 @@
|
|
|
45
45
|
(2,'PHP'),
|
|
46
46
|
(3,'LINUX'),
|
|
47
47
|
(4,'C#');
|
|
48
|
+
```
|
|
49
|
+
|
|
50
|
+
#SELECT
|
|
51
|
+
|
|
52
|
+
```sql
|
|
53
|
+
SELECT
|
|
54
|
+
m.id, m.name, group_concat(s.spec) AS specs
|
|
55
|
+
FROM member m
|
|
56
|
+
LEFT JOIN abilities a ON m.id=a.member_id
|
|
57
|
+
LEFT JOIN spec s ON a.spec_id = s.id
|
|
58
|
+
GROUP BY m.id
|
|
48
59
|
```
|
1
修正
answer
CHANGED
|
@@ -1,3 +1,48 @@
|
|
|
1
1
|
ability テーブルは
|
|
2
2
|
|
|
3
|
-
id, member_id, spec_id で構成する方が王道ですね。
|
|
3
|
+
id, member_id, spec_id で構成する方が王道ですね。
|
|
4
|
+
|
|
5
|
+
---
|
|
6
|
+
|
|
7
|
+
#テーブル定義
|
|
8
|
+
|
|
9
|
+
```sql
|
|
10
|
+
CREATE TABLE `abilities` (
|
|
11
|
+
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
|
|
12
|
+
`member_id` int(11) DEFAULT NULL,
|
|
13
|
+
`spec_id` int(11) DEFAULT NULL,
|
|
14
|
+
PRIMARY KEY (`id`)
|
|
15
|
+
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
|
|
16
|
+
|
|
17
|
+
INSERT INTO `abilities` (`id`, `member_id`, `spec_id`)
|
|
18
|
+
VALUES
|
|
19
|
+
(1,1,1),
|
|
20
|
+
(2,1,2),
|
|
21
|
+
(3,2,1),
|
|
22
|
+
(4,2,3),
|
|
23
|
+
(5,2,4);
|
|
24
|
+
|
|
25
|
+
CREATE TABLE `member` (
|
|
26
|
+
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
|
|
27
|
+
`name` varchar(641) NOT NULL DEFAULT '',
|
|
28
|
+
PRIMARY KEY (`id`)
|
|
29
|
+
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
|
|
30
|
+
|
|
31
|
+
INSERT INTO `member` (`id`, `name`)
|
|
32
|
+
VALUES
|
|
33
|
+
(1,'tanaka'),
|
|
34
|
+
(2,'suzuki');
|
|
35
|
+
|
|
36
|
+
CREATE TABLE `spec` (
|
|
37
|
+
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
|
|
38
|
+
`spec` varchar(64) NOT NULL DEFAULT '',
|
|
39
|
+
PRIMARY KEY (`id`)
|
|
40
|
+
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
|
|
41
|
+
|
|
42
|
+
INSERT INTO `spec` (`id`, `spec`)
|
|
43
|
+
VALUES
|
|
44
|
+
(1,'MySQL'),
|
|
45
|
+
(2,'PHP'),
|
|
46
|
+
(3,'LINUX'),
|
|
47
|
+
(4,'C#');
|
|
48
|
+
```
|