回答編集履歴
1
sample
test
CHANGED
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@@ -14,6 +14,92 @@
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# sample
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ちょっとうまく伝わらないようなので例示します
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前回SQLはわすれてください
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元データ
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※areaはとりあえず2種としてあります、sexは仮に1=男、2=女とします
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```SQL
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create table tbl(uid int unique,uname varchar(30),area int,sex tinyint);
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insert into tbl values
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(1,'aaa',1,1),
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(2,'bbb',1,1),
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(3,'ccc',1,2),
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(4,'ddd',1,2),
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(5,'eee',1,2),
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(7,'fff',1,2),
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(8,'ggg',1,1),
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(9,'hhh',1,2),
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(10,'iii',2,1);
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```
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抽出
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※area=1に対して、idが若い順に女性・男性を交互に3人ずつ表示します
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```SQL
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select uid,uname,area,sex
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,(select count(*)+1 from tbl as t2
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-
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where t1.area=t2.area and t1.sex=t2.sex and t1.uid>t2.uid
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) as rank
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from tbl as t1
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where area=1
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having rank<=3
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order by rank asc,sex desc
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```
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結果
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|uid|uname|area|sex|rank|
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|--:|:--|--:|--:|--:|
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|3|ccc|1|2|1|
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|1|aaa|1|1|1|
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|4|ddd|1|2|2|
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|2|bbb|1|1|2|
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|5|eee|1|2|3|
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|8|ggg|1|1|3|
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