回答編集履歴
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sample
test
CHANGED
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@@ -7,3 +7,53 @@
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7
7
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構成上どうしても変更ができないなら、そうとうこねくり回せば
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8
8
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9
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不可能ではないと思いますが、効率がわるくスピードは期待できません
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10
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# sample
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**おすすめしないのは変わりません**が、一応サンプルだけ付けておきます
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- 元データ
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```SQL
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create table number(id int unique,number varchar(30));
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insert into number values(1,'1 2 3'),(2,'3 4');
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create table title(id int unique,number varchar(10),title varchar(10));
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insert into title values(1,'1','A'),(2,'2','B'),(3,'3','C'),(4,'4','D'),(5,'6','E');
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```
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- とりあえず抽出
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```SQL
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select t1.id,t2.title from number as t1
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left join title as t2 on t1.number regexp concat('(^| )',t2.number,'( |$)')
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```
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- タイトルもスペース区切りで1カラムにまとめる
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```SQL
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select t1.id,group_concat(t2.title order by t2.number separator ' ') as title
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from number as t1
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left join title as t2 on t1.number regexp concat('(^| )',t2.number,'( |$)')
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group by id
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```
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