回答編集履歴
3
カラム名の修正
test
CHANGED
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@@ -166,7 +166,7 @@
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166
166
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167
167
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168
168
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169
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-
SELECT f.name, group_concat(m.name) AS
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169
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+
SELECT f.name, group_concat(m.name) AS members
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170
170
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171
171
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FROM favorites AS fav
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172
172
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@@ -188,4 +188,4 @@
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188
188
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189
189
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190
190
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191
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-
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2
整形
test
CHANGED
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@@ -84,7 +84,7 @@
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84
84
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85
85
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86
86
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87
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-
create table fruits(
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87
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+
create table fruits (
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88
88
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89
89
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fruit_id int PRIMARY KEY,
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90
90
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@@ -94,7 +94,7 @@
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94
94
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95
95
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96
96
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97
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-
create table favorites(
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97
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+
create table favorites (
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98
98
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99
99
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member_id int,
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100
100
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@@ -126,7 +126,9 @@
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126
126
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127
127
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128
128
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129
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-
SELECT m.name, group_concat(f.name) AS fruits
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129
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+
SELECT m.name, group_concat(f.name) AS fruits
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130
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+
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131
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+
FROM favorites AS fav
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130
132
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131
133
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LEFT JOIN members AS m
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132
134
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@@ -164,7 +166,9 @@
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164
166
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165
167
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166
168
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167
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-
SELECT f.name, group_concat(m.name) AS fruits
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169
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+
SELECT f.name, group_concat(m.name) AS fruits
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170
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+
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171
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FROM favorites AS fav
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168
172
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169
173
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LEFT JOIN members AS m
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170
174
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1
別視点追加
test
CHANGED
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@@ -151,3 +151,37 @@
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151
151
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152
152
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153
153
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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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+
####別視点
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158
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+
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159
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+
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160
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+
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161
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+
```SQL
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162
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+
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163
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+
use test;
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164
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+
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165
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+
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166
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+
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167
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+
SELECT f.name, group_concat(m.name) AS fruits FROM favorites AS fav
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168
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+
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169
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+
LEFT JOIN members AS m
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170
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+
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171
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+
USING (member_id)
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172
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+
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173
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+
LEFT JOIN fruits AS f
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174
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+
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175
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+
USING (fruit_id)
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176
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+
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177
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+
GROUP BY f.fruit_id;
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178
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+
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179
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+
```
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180
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+
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181
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+
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182
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+
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183
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+
####SELECT結果
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184
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+
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185
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+
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186
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+
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187
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+
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