回答編集履歴
1
改良
answer
CHANGED
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@@ -17,4 +17,19 @@
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17
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) as t3 using(use_date,in_station,out_station)
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inner join ic as t4 on coalesce(id1,id0)=id
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19
19
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20
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```
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+
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# 改良版
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```SQL
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select * from ic
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where id in (
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select min(id) from ic
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where (use_date,in_station,out_station,is_request) in (
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select use_date,in_station,out_station,max(is_request) as is_request from ic
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where is_request in (0,1)
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group by use_date,in_station,out_station
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)
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group by use_date,in_station,out_station
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);
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```
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