给定一些说明的SQL如何找到AVG

时间：2018-11-25 13:05:20

标签： sql

我正在尝试创建一个查询，该查询返回给我Market.name和在特定市场工作的雇员的平均值，例如，为“宜家”工作的雇员的平均值为10％所有市场中的员工总数。

This is a part of the database schema

2 个答案:

答案 0 :(得分：0)

您需要带有连接的此类SQL语句

   select m.name market_name,
           100*round(count(w.employee_id)::decimal/
                (select count(employee_id) from employee ),2)
            as "Avg Percent of Emp. Per Market"
      from workson w
      left join market m on ( m.market_id = w.market_id )
    where m.name = 'IKEA' 
    group by m.name;

我不知道您的DBMS，我尝试过是否是Postgres，如果是MySQL

，请删除 :: decimal

Rextester Demo 1

Rextester Demo 2

答案 1 :(得分：0)

尝试一下

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