回答編集履歴
3
けっか
test
CHANGED
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@@ -145,3 +145,17 @@
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145
145
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) as sub2 using(post_id)
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146
146
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147
147
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```
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148
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+
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149
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+
- 結果
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150
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+
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151
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+
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152
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+
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153
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+
|post_id|名前|件名1|参加1|件名2|参加2|
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154
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+
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155
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+
|--:|:--|:--|--:|:--|--:|
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156
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+
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157
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+
|1|山田太郎|参加|1|不参加|0|
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158
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+
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159
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+
|2|田中花子|参加|1|参加|1|
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160
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+
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161
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+
|NULL|NULL|NULL|2|NULL|1|
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2
むりやり
test
CHANGED
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@@ -63,3 +63,85 @@
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63
63
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(3,'合同イベント','鈴木一郎','不参加','不参加');
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64
64
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65
65
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```
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66
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+
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67
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+
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68
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+
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69
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+
# 無理やりやってみる
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70
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+
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71
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+
```SQL
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72
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+
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73
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+
create table at_postmeta(post_id int,meta_key varchar(10),meta_value varchar(10));
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74
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+
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75
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+
insert into at_postmeta values
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76
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+
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77
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+
(1,'イベント名','役員会議'),
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78
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+
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79
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+
(1,'名前','山田太郎'),
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80
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+
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81
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+
(1,'件名1','参加'),
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82
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+
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83
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+
(1,'件名2','不参加'),
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84
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+
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85
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+
(2,'イベント名','役員会議'),
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86
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+
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87
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+
(2,'名前','田中花子'),
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88
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+
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89
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+
(2,'件名1','参加'),
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90
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+
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91
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+
(2,'件名2','参加'),
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92
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+
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93
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+
(3,'イベント名','合同イベント'),
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94
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+
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95
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+
(3,'名前','鈴木一郎'),
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96
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+
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97
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+
(3,'件名1','不参加'),
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98
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+
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99
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+
(3,'件名2','不参加');
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100
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+
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101
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+
```
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102
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+
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103
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+
- 検索
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|
104
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+
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105
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+
```SQL
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106
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+
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107
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+
select post_id,名前,件名1,参加1,件名2,参加2
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108
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+
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109
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+
from (
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110
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+
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111
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+
select t1.post_id,
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112
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+
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113
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+
group_concat(case meta_key when "名前" then meta_value else null end) 名前,
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114
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+
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115
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+
group_concat(case meta_key when "件名1" then meta_value else null end) 件名1,
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116
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+
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117
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+
group_concat(case meta_key when "件名2" then meta_value else null end) 件名2
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118
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+
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119
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+
from at_postmeta as t1
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120
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+
|
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121
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+
inner join (select post_id from at_postmeta where meta_key='イベント名' and meta_value='役員会議') as t2
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122
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+
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123
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+
on t1.post_id=t2.post_id
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124
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+
|
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125
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+
group by post_id
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126
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+
|
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127
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+
) as sub1 right join (
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128
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+
|
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129
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+
select t1.post_id,
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130
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+
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131
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+
sum((meta_key="件名1")*(meta_value="参加")) 参加1,
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132
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+
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133
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+
sum((meta_key="件名2")*(meta_value="参加")) 参加2
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134
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+
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135
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+
from at_postmeta as t1
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136
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+
|
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137
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+
inner join (select post_id from at_postmeta where meta_key='イベント名' and meta_value='役員会議') as t2
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138
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+
|
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139
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+
on t1.post_id=t2.post_id
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140
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+
|
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141
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+
group by post_id
|
|
142
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+
|
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143
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+
with rollup
|
|
144
|
+
|
|
145
|
+
) as sub2 using(post_id)
|
|
146
|
+
|
|
147
|
+
```
|
1
調整
test
CHANGED
|
@@ -37,3 +37,29 @@
|
|
|
37
37
|
```
|
|
38
38
|
|
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39
39
|
だと思います
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|
40
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+
|
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41
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+
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42
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+
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43
|
+
# テーブルの設計から
|
|
44
|
+
|
|
45
|
+
```SQL
|
|
46
|
+
|
|
47
|
+
create table tbl(id int primary key,
|
|
48
|
+
|
|
49
|
+
イベント名 varchar(10),
|
|
50
|
+
|
|
51
|
+
名前 varchar(10),
|
|
52
|
+
|
|
53
|
+
件名1 varchar(10),
|
|
54
|
+
|
|
55
|
+
件名2 varchar(10));
|
|
56
|
+
|
|
57
|
+
insert into tbl values
|
|
58
|
+
|
|
59
|
+
(1,'役員会議','山田太郎','参加','不参加'),
|
|
60
|
+
|
|
61
|
+
(2,'役員会議','田中花子','参加','参加'),
|
|
62
|
+
|
|
63
|
+
(3,'合同イベント','鈴木一郎','不参加','不参加');
|
|
64
|
+
|
|
65
|
+
```
|