回答編集履歴
2
追記
answer
CHANGED
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@@ -23,3 +23,24 @@
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23
23
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```
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24
24
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25
25
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定番のパターンです。
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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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+
カンマ区切りにするなら `group_concat` を使う（MySQL 限定）。
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30
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+
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31
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+
```lang-sql
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32
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select
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33
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user_id, name, group_concat(sub) as sub
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34
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from (
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35
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select
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36
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t.user_id, t.name, t.sub
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37
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from
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38
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t inner join t as t2 on t.user_id = t2.user_id
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39
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group by
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40
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t.id, t.user_id, t.name, t.sub, t.point
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41
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having
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42
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t.point = max(t2.point)
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43
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) as x
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44
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group by
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45
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user_id, name
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46
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```
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1
追記
answer
CHANGED
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@@ -1,4 +1,4 @@
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1
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-
サブクエリで。
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1
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+
相関サブクエリで max を条件にする。
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2
2
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3
3
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```lang-sql
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4
4
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select t.user_id, t.name, t.sub
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@@ -7,4 +7,19 @@
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7
7
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t.point = (
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8
8
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select max(point) from t t2 where t2.user_id = t.user_id group by t.user_id
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9
9
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)
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10
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-
```
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10
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+
```
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11
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+
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12
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+
自己結合で group by ... having で絞る。
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13
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+
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14
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+
```lang-sql
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15
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select
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16
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t.user_id, t.name, t.sub
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17
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from
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18
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t inner join t as t2 on t.user_id = t2.user_id
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19
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+
group by
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20
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+
t.id, t.user_id, t.name, t.sub, t.point
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21
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+
having
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22
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t.point = max(t2.point)
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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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+
定番のパターンです。
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