如何展平SQL查询的结果？

Question

I have a query that returns the following table:

Year    IsFunded     NotFunded
2003    Null         4
2003    3            Null
2004    Null         2
2004    8            Null

So I need:

SELECT Year, IsFunded, NotFunded
FROM
(
    --myQuery that returns unflattened results
)

I just need one row for each year. like:

Year    IsFunded     NotFunded
2003    3            4
2004    8            2

Answer 1

Use GROUP BY and MAX :

SELECT t.Year, MAX(t.IsFunded) AS IsFunded, MAX(t.NotFunded) AS NotFunded
FROM 
(
    --myQuery that returns unflattened results
) AS t
GROUP BY t.Year;

Answer 2

I would replace null with 0 while sum and just add group by year, like below

           with MyQuery(Year,IsFunded,NotFunded) as (
          select 2003,Null,4 from dual union
          select 2003,3,Null from dual union
          select 2004,Null,2 from dual union
          select 2004,8,Null from dual
          )
          select year,sum(case when IsFunded is null then 0 else IsFunded end) as IsFunded,
          sum(case when NotFunded is null then 0 else NotFunded end) as NotFunded
          from MyQuery group by year

Output

        YEAR ISFUNDED  NOTFUNDED
        2003     3         4
        2004     8         2