質問編集履歴
1
userテーブルを追記しました
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@@ -10,7 +10,7 @@
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```SQL
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select `itemID`, MAX(
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select `itemID`, MAX(Name), AVG(value) as r_avg from `table_a` left join `table_b` on `table_a`.`itemID` = `table_b`.`itemID` left join `table_c` on `table_a`.`UserId` = `table_c`.`UserId` group by `itemID`;
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```
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@@ -22,9 +22,9 @@
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|:--|:--:|:--:|
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|1|item1|
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|1|item1|1|
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|2|item2|
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|2|item2|2|
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@@ -34,11 +34,25 @@
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|1|1|
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|1|1|1|
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|1|5|
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|1|5|2|
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|1|3|3|
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●table_c:usersテーブル
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|UserID|Name|
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|1|userA|
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|2|userB|
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|3|userC|
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