回答編集履歴
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追記
test
CHANGED
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@@ -11,3 +11,37 @@
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みたいにやって、group_cocantで他のテーブルから色名をとってきて結合します
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# sample
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```SQL
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create table color(c_id int primary key,c_name varchar(30));
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insert into color values(1,'ブラック'),(2,'ホワイト'),(3,'グレー');
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create table user_color(u_id int ,c_id int,unique(u_id,c_id));
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insert into user_color values(100,1),(100,2);
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```
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```SQL
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select u_id,group_concat(c_name order by t1.c_id) as color
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from color as t1
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inner join user_color as t2 on t1.c_id=t2.c_id
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group by u_id
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```
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