回答編集履歴
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追加
test
CHANGED
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@@ -13,3 +13,15 @@
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13
13
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group by 1 having(count(group_id)=2);
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14
14
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15
15
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```
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16
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+
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17
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+
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18
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+
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19
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```sql2
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20
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+
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21
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select group_id,group_name from groups
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22
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23
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join (select group_id from users_groups join users on member_id=user_id and member_id=1) t1 using(group_id)
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24
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25
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join (select group_id from users_groups join users on member_id=user_id and member_id=2) t2 using(group_id);
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26
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+
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27
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```
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