Question

我正在进行查询，我需要在各种条件下找到总和。现在我的查询是： sum(case when sum(C_amount)>3 then 6 else sum(C_amount) end) as S_C_amount from table A group by item

但在第三种情况下我需要在When条件中使用sum函数

not a single group-by。

我无法实现第三个条件。我收到klci = ['1015', '6399', '6888', '4162', '1023', '6947', '3034'] klse = '.KL' tickers = klci + klse print(tickers)错误。

Answer 1

如果没有一些示例数据，很难确定您要实现的目标，但在相同的组中使用SUM(SUM(value))不会仅仅使用{{1所以看起来你可以使用：

SQL Fiddle

Oracle 11g R2架构设置：

SUM(value)

查询1 ：

CREATE TABLE A ( item, A_Amount, B_Amount, C_Amount, cond ) AS
SELECT 1, 1, 1, 1, 1 FROM DUAL UNION ALL
SELECT 1, 1, 1, 1, 2 FROM DUAL UNION ALL
SELECT 1, 1, 1, 1, 3 FROM DUAL UNION ALL
SELECT 1, 1, 1, 0, 4 FROM DUAL UNION ALL
SELECT 2, 2, 2, 2, 1 FROM DUAL UNION ALL
SELECT 2, 2, 2, 2, 2 FROM DUAL UNION ALL
SELECT 2, 2, 2, 2, 3 FROM DUAL UNION ALL
SELECT 2, 2, 2, 2, 4 FROM DUAL;

<强> Results ：

SELECT item,
       SUM( CASE WHEN cond > 0 THEN A_amount END ) AS S_A_amount,
       SUM( CASE WHEN cond > 0 THEN B_amount END ) AS S_B_amount,
       CASE WHEN SUM(C_amount)>3 THEN 6 ELSE SUM(C_amount) END AS S_C_amount
FROM   A
GROUP BY item

Answer 2

这是你需要的吗？

select case
          when sum_c_amount > 3 then
           6
          else
           sum_c_amount
       end as s_c_amount
  from (select sum(c_amount) as sum_c_amount
          from table a
         group by item)

Answer 3

将现有查询移动到子查询中，并将案例表达式逻辑放在外部查询图层中，例如

select
       d.*
     , case when S_C_amount > 3 then 6 else S_C_amount end
from (
      select
            item
          , sum(case when condition then A_amount end) as S_A_amount
          , sum(case when condition then B_amount end) as S_B_amount
          , sum(case when condition then C_amount end) as S_C_amount
      from t
      group by item
      ) d

Answer 4

我会做这样的事情：

SELECT item,
       sum(case when condition then A_amount end) as S_A_amount,
       sum(case when condition then B_amount end) as S_B_amount,
       sum(case when s_c_amount>3 then 6 else s_c_amount end) as S_C_amount
 FROM (select item,
              A_amount,
              B_amount,
              sum(C_amount) over (partition by item) as s_c_amount
         from table A)
GROUP BY item

Case语句中的Sum函数

4 个答案: