回答編集履歴
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修正
test
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@@ -15,3 +15,61 @@
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のようなやり方になります。あとはSQLの種類によって
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じゃっかん書き方がかわってくると思います
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# 修正します
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構文が間違っていたようです、以下修正します
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```SQL
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create table employees(user_id int unique,department_id int,salary int);
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insert into employees values
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(1001,10,250000),(1002,10,270000),(1003,10,280000),(2001,20,300000),(2002,20,220000),(3001,30,250000);
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```
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集計
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```ここに言語を入力
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select t1.department_id
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,avg(salary) as avg
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,sum(case when t1.salary>t2.avg then 1 else 0 end) avg_up
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from employees as t1
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inner join (select
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department_id
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,avg(salary) as avg
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from
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employees
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group by
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department_id
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) as t2 on t1.department_id=t2.department_id
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group by department_id
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```
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