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 usr.user_id
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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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または
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24
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25
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```SQL
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26
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27
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select usr.user_id, usr.name, act.action_id, act.date, act.action
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28
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29
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from user usr left join action act
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30
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on usr.user_id=act.user_id
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32
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33
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where (act.date, act.action_id) in (
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34
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35
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select max(date), max(action_id) from action
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36
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37
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where user_id=usr.user_id and date>=act.date
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38
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)
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40
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or act.action_id is null
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order by usr.user_id
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45
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```
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