Question

我正在尝试根据下表创建一个SELECT语句，该语句将显示特定行以及每个Activity已完成的总小时数。

Employee Details    Activity Details           Week Number  Hours Worked
1   Clyde            163    Sales and Marketing       39     10
1   Clyde            163    Sales and Marketing       40      8
1   Clyde            163    Sales and Marketing       42      6
1   Clyde            151    Web Design                41      5
1   Clyde            151    Web Design                42      5.5
2   Sally            155    Python Coding             39      10
2   Sally            165    Testing                   39      15
2   Sally            155    Python Coding             42      10
2   Sally            165    Testing                   40      20
2   Sally            155    Python Coding             41      10
5   Tara             155    Python Coding             39      8
5   Tara             155    Python Coding             40      6
5   Tara             155    Python Coding             41      5
5   Tara             151    Web Design                42      11.5
6   Mike             151    Web Design                39      1
6   Mike             151    Web Design                40      1
6   Mike             151    Web Design                41      1

到目前为止，这是我的代码。一切都很好，除了计算每个活动花费的小时数。这段代码给出了这个错误：单行子查询返回多行。我知道这段代码有错误，但我认为这是最清楚的方法告诉你。

 SELECT a1.ActId,a2.Description,(SELECT SUM (HrsWorked) from ACTION GROUP BY ActId) AS "Total Hours",a1.HrsWorked * a3.HourlyRate AS "Total Pay"
FROM ACTION a1
INNER JOIN ACTIVITY a2 ON a1.ActId = a2.ActId
INNER JOIN ALLOCATION a3 ON a1.EmpId = a3.EmpId;

由于

Answer 1

我认为您可以根据需要使用窗口函数：

select a.*,
       sum(hoursworked) over (partition by activity) as totalhours
from action a;

显示每个活动的总小时数

1 个答案: