Question

我有一个脚本可以从数据库中提取事务及其详细信息。但是我的用户抱怨生成的文件大小太大，因此他们要求某些交易只是总结/合并而不是它们具有某种分类，比如检查帐户。这意味着结果集中只应该有一行名为“Checking”，其中包含Checking Accounts下所有交易的总和。有没有办法使SQL脚本像：

CASE 
    WHEN Acct_class = 'Checking'
        then sum(tran_amount)
    ELSE tran_amount
END

我已经有了正确的GROUP BY和ORDER BY语句，但我似乎无法得到我想要的输出。结果集中仍有多个“正在检查”行。任何想法都会非常感激。

Answer 1

试试这个，

   Select sum(tran_amount) From tran_amount Where Acct_class = 'Checking'

Answer 2

您可以尝试使用the git-log documentation

实现此目的

SELECT tran_amount, .... FROM table WHERE NOT Acct_class = 'Checking'
UNION ALL
SELECT SUM(tran_amount), .... FROM table WHERE Acct_class = 'Checking' GROUP BY Acct_class, ...;

Answer 3

您可以尝试以下内容，为某些类保留单行，并为其他类聚合：

with test (id, class, amount) as
(
select 1, 'a'       , 100 from dual union all
select 2, 'a'       , 100 from dual union all
select 3, 'Checking', 100 from dual union all
select 4, 'Checking', 100 from dual union all
select 5, 'c'       , 100 from dual union all
select 6, 'c'       , 100 from dual union all
select 7, 'c'       , 100 from dual union all
select 8, 'd'       , 100 from dual
)
select sum(amount), class
from test
group by case 
                when class = 'Checking' then null /* aggregates elements of class 'b' */
                else id /* keeps elements of other classes not aggregated */
         end,
         class

Answer 4

嗨，你可以尝试下面的sql

select account_class, 
case when account_class = 'saving' then listagg(trans_detail, ',')  within group (order by emp_name) -- will give you all details transactions 
                 when account_class = 'checking' then to_char(sum(trans_detail)) -- will give you only sum of transactions
                                             end  as trans_det from emp group by account_class;

Answer 5

或者，如果您想要的输出得到总和，或者基于另一个列值的实际列值，解决方案是使用分析函数将总和与实际值一起得到：

select 
    decode(acct_class, 'Checking', tran_amount_sum, tran_amount) 
  from (
    select 
        sum(tran_amount) over (partition by acct_class) as tran_amount_sum, 
        tran_amount, 
        acct_class 
      from 
        YOUR_TABLE
  )

在某些条件下使用SUM

5 个答案: