回答編集履歴
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@@ -15,4 +15,22 @@
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inner join item as t2
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on json_contains(t1.item_id,t2.id)
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group by id;
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```
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# jsonにこだわらないバージョン
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```sql
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create table user (
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id int primary key ,
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item_id varchar(20));
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insert into user values(1,'1,2');
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create table item (
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id int primary key ,
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name varchar(10));
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insert into item values(1,'ノート'),(2,'鉛筆'),(3,'消しゴム');
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select t1.id,group_concat(t2.name) from user as t1
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inner join item as t2
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on find_in_set(t2.id,t1.item_id)
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group by id;
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```
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