在 SQL 服务器中使用 SUM Function 时如何显示 Null 值

Question

I have issue with my script in SQL Server, i need to show Total of 3 Columns with NULL Values

here is my query:

SELECT 
    Bucket,
        (SELECT SUM (OutstandingPrincipal)  FROM example
        WHERE [status] = 'Covid')
    AS Covid,
        (SELECT SUM (OutstandingPrincipal) FROM example
        WHERE [status] LIKE '%Disbu%')
    AS Disburs_After,
        (SELECT SUM (OutstandingPrincipal) FROM example
        WHERE [status] = 'Non Covid')
    AS Non_Covid
FROM example
WHERE Bucket IS NOT NULL
GROUP BY 
    Bucket

how is it possible? thanks in advance

Answer 1

If I'm understanding your data correctly, no need for all those subqueries, you can just use conditional aggregation :

select bucket,
       sum(case when status = 'Covid' then OutstandingPrincipal end) as covid,
       sum(case when status like '%Disbu%' then OutstandingPrincipal end) as Disburs_After,
       sum(case when status = 'Non Covid' then OutstandingPrincipal end) as Non_Covid
from example
where bucket is not null
group by bucket