Question

对于拥有多个员工的分支机构，显示分支机构名称，员工人数（员工人数），工资总额（工资）和平均工资水平（“平均工资”）。用“ $”格式设置所有美元金额。

下面是我的代码来回答此查询，但是我收到无效的数字错误。

select br_branchname, count (st_staffno) as "Headcount", 
    sum(to_char (st_salary, '$99,999.00')) as "Payroll", 
    avg(to_char (st_salary, '$99,999.00')) as "Average Salary"
from branch join staff
on st_br_branchno = br_branchno
group by br_branchname
having count (st_staffno) > 1;

Answer 1

您将TO_CHAR和AVG/SUM颠倒了：

select br_branchname,
       count (st_staffno) as "Headcount", 
       TO_CHAR(SUM(st_salary), '$99,999.00') as "Payroll", 
       TO_CHAR(AVG(st_salary), '$99,999.00') as "Average Salary"
from branch
INNER join staff
  on st_br_branchno = br_branchno
group by br_branchname
having count (st_staffno) > 1

您需要在堆叠函数调用的“外部”使用TO_CHAR-否则，您将试图计算包含'$'的字符串的平均值和总和，而Oracle则是正确的确定$不是有效数字的合适位置。

好运。

数学和to_char

1 个答案: