回答編集履歴
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付き
test
CHANGED
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@@ -13,3 +13,53 @@
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もっと効率的な処理が必要かもしれませんが、とりあえずダブりはなくなるでしょう
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# 追記
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sample確認しました。
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これはtagとcategoryを別々に処理してサブクエリでつなぐのが楽でしょう
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```SQL
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SELECT *
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FROM locations as t1
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left join(
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/* ここからtagまとめ */
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select t2.location_id as id,group_concat(t3.name) as tags
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from location_tags as t2
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inner join tags as t3 ON t2.tag_id = t3.id
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group by t2.location_id
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/* ここまで */
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) as t6 using(id)
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left join (
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/* ここからcategoryまとめ */
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select t4.location_id as id,group_concat(t5.name) as categories
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from location_categories as t4
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inner join categories as t5 ON t4.category_id = t5.id
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group by t4.location_id
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/* ここまで */
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) as t7 using(id)
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order by id
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```
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