如何在 MS SQL Server 表上进行选择以在一行中显示其某些列数据并使用 sum 函数

Question

I have a MS SQL Server table as below:

and I need to change it into below format with TSQL:

How can I do this? Any help will be appriciated!

Answer 1

You can do conditional aggregation:

select 
    title, 
    max(case when [type] = 'type1' then [number] end) [type1],
    max(case when [type] = 'type2' then [number] end) [type2]
from mytable
group by title

If you may possibly have more than one record for a given (title, type) tuple, you might want to use another aggregate function than max() , like sum() or avg() .

Answer 2

Sounds like you want a PIVOT ...

SELECT title,  
    [type1] AS type1,  
    [type2] AS type2  
FROM  
    (SELECT title, [type], [number])   
    AS Source  
PIVOT  
(  
    sum([number])  
FOR   
[[type]]   
    IN ( [type1], [type2])  
) AS PVT;

https://docs.microsoft.com/en-us/sql/t-sql/queries/from-using-pivot-and-unpivot?view=sql-server-ver15