回答編集履歴
1
追記
test
CHANGED
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@@ -19,3 +19,27 @@
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19
19
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order by ID
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20
20
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21
21
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```
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22
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+
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23
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+
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24
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+
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25
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+
どうしても1回のjoinで処理したいときは少し複雑になります
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26
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+
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27
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+
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28
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+
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29
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+
```SQL
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30
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+
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31
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32
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33
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select t1.ID
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34
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35
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,group_concat(case t1.company1 when t2.ID then t2.name end) as company1_name
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36
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37
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,group_concat(case t1.company2 when t2.ID then t2.name end) as company2_name
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38
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39
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from MEMBER as t1
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40
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41
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inner join COMPANY as t2 ON t1.company1=t2.ID or t1.company2=t2.ID
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42
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43
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group by t1.ID;
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44
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+
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45
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```
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