Question

我的表有千行和两个主列（invoice_no，exe_amount），我想写下面的查询：

select invoice_ no, 
       exe_amount, 
       exe_amount*0.02 as edu_duty, 
       exe_amount*0.01 as ed_duty, 
       (exe_amount + edu_duty + ed_duty) as sub_total, 
       subtotal*0.0605 as st_amount, 
       sub_total*.0103 as ot_amount,
       exe_amount + subtotal + st_amount + ot_amount as gd_amount 
from table1;

如果我使用变量查询它会产生多个值的错误。

我该如何处理？ Aany教程链接解决问题？

Answer 1

您无法在计算时使用别名

select invoice_ no, 
       exe_amount, 
       exe_amount*0.02 as edu_duty, 
       exe_amount*0.01 as ed_duty, 
      (exe_amount + (exe_amount*0.02) + (exe_amount*0.01)) as sub_total, 
      ((exe_amount + (exe_amount*0.02) + (exe_amount*0.01)))*0.0605 as st_amount, 
      (exe_amount + (exe_amount*0.02) + (exe_amount*0.01)) *.0103 as ot_amount,
      ( exe_amount + 
        (exe_amount + (exe_amount*0.02) + (exe_amount*0.01)) + 
        ((exe_amount + (exe_amount*0.02) + (exe_amount*0.01)))*0.0605 + (exe_amount + (exe_amount*0.02) + (exe_amount*0.01)) *.0103 
      ) as gd_amount 
from table1;

Alter Native to above one is

SELECT invoice_ no,
       exe_amount,
       edu_duty ,
       ed_duty,
       sub_total,
       subtotal*0.0605 as st_amount, 
       sub_total*.0103 as ot_amount,
       exe_amount + subtotal + (subtotal*0.0605) + (sub_total*.0103) as gd_amount
FROM (
        select invoice_ no, 
               exe_amount, 
               exe_amount*0.02 as edu_duty, 
               exe_amount*0.01 as ed_duty, 
              (exe_amount + (exe_amount*0.02) + (exe_amount*0.01)) as sub_total
       from tableName
)t

如何从查询中选择数据进行计算

1 个答案: