質問編集履歴
3
誤字を訂正
test
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File without changes
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test
CHANGED
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@@ -58,7 +58,7 @@
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58
58
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59
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VALUES
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60
60
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61
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-
(1, '赤くて緑で紫'),(2, '緑'),(3, '
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61
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+
(1, '赤くて緑で紫'),(2, '緑で紫'),(3, '赤'),(4, '青'),(5, '赤くて紫')
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62
62
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63
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;
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64
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2
欲しい結果を追加
test
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test
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@@ -14,6 +14,28 @@
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14
14
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15
15
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17
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+
###欲しい結果
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18
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+
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19
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+
「redとpurpleのタグを持つ記事」とは「tag_id=1とtag_id=5を持つ記事」になります。
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20
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+
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21
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+
つまり「post_id=1とpost_id=5の記事」であり以下の結果が欲しいです。
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22
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+
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23
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+
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24
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+
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25
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+
|ID|content|
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26
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+
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27
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+
|:--:|:--:|
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28
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+
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29
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+
|1|赤くて緑で紫|
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30
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+
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31
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+
|5|赤くて紫|
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32
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+
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33
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+
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34
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+
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35
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+
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36
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+
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37
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+
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38
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+
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17
39
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###テーブル設計
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18
40
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19
41
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CREATE、INSERTです。
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1
テーブル設計を修正
test
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File without changes
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test
CHANGED
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@@ -20,11 +20,15 @@
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20
20
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21
21
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```MySQL
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22
22
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23
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-
CREATE TABLE wp_posts
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23
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+
CREATE TABLE wp_posts (
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24
24
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25
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-
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25
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+
`ID` int,
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26
26
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27
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+
`content` varchar(100),
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28
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+
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29
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+
PRIMARY KEY (`ID`)
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30
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+
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27
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-
;
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31
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+
);
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28
32
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29
33
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INSERT INTO wp_posts
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30
34
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@@ -38,11 +42,17 @@
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38
42
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39
43
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40
44
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41
|
-
CREATE TABLE wp_tags
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45
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+
CREATE TABLE wp_tags (
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42
46
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43
|
-
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|
47
|
+
`ID` int,
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44
48
|
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|
49
|
+
`tag_name` varchar(10),
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50
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+
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51
|
+
PRIMARY KEY (`ID`),
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52
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+
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53
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+
INDEX index_wp_tags_1 (`tag_name`)
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54
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+
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45
|
-
;
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55
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+
);
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46
56
|
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47
57
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INSERT INTO wp_tags
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48
58
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@@ -56,21 +66,29 @@
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56
66
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57
67
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58
68
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59
|
-
CREATE TABLE wp_tag_holders
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69
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+
CREATE TABLE wp_tag_holders (
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60
70
|
|
|
71
|
+
`tag_ID` int,
|
|
72
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+
|
|
73
|
+
`post_ID` int,
|
|
74
|
+
|
|
75
|
+
CONSTRAINT foreign_wp_tag_holders_01 FOREIGN KEY (`tag_ID`) REFERENCES wp_tags(`ID`),
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|
76
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+
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|
77
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+
INDEX index_wp_tag_holders_1 (`post_ID`)
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|
78
|
+
|
|
79
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+
);
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|
80
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+
|
|
81
|
+
INSERT INTO wp_tag_holders
|
|
82
|
+
|
|
61
|
-
(`tag_ID`
|
|
83
|
+
(`tag_ID`,`post_ID`)
|
|
84
|
+
|
|
85
|
+
VALUES
|
|
86
|
+
|
|
87
|
+
(1, 1),(2, 1),(5, 1),(2, 2),(5, 2),(1, 3),(3, 4),(1, 5),(5, 5)
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|
62
88
|
|
|
63
89
|
;
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64
90
|
|
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65
|
-
INSERT INTO wp_tag_holders
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|
66
91
|
|
|
67
|
-
(`post_ID`,`tag_ID`)
|
|
68
|
-
|
|
69
|
-
VALUES
|
|
70
|
-
|
|
71
|
-
(1, 1),(1, 2),(1, 5),(2, 2),(3, 5),(3, 1),(4, 3),(5, 1),(5, 5)
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|
72
|
-
|
|
73
|
-
;
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74
92
|
|
|
75
93
|
```
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76
94
|
|