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[英]How to write a query with an average column in SQL Server Management Studio
[英]How to write a SQL query to find average of each value in that column?
这是我的输入表参考:input_table。
我需要像 ref: output_table 这样的输出表
输入表:
depname | empno | salary |
----------+-------+--------+
develop | 11 | 5200 |
develop | 7 | 4200 |
develop | 9 | 4500 |
develop | 8 | 6000 |
develop | 10 | 5200 |
personnel | 5 | 3500 |
personnel | 2 | 3900 |
sales | 3 | 4800 |
sales | 1 | 5000 |
sales | 4 | 4800 |
输出表:
depname | empno | salary | avg_salary |
----------+-------+--------+------------+
develop | 11 | 5200 | 5020 |
develop | 7 | 4200 | 5020 |
develop | 9 | 4500 | 5020 |
develop | 8 | 6000 | 5020 |
develop | 10 | 5200 | 5020 |
personnel | 5 | 3500 | 3700 |
personnel | 2 | 3900 | 3700 |
sales | 3 | 4800 | 4867 |
sales | 1 | 5000 | 4867 |
sales | 4 | 4800 | 4867 |
任何人都可以为此编写 SQL 查询吗?
您想使用avg()
作为窗口函数:
select depname, empno, salary,
avg(salary) over (partition by depname) as avg_salary
from t;
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