使用日期列将表格从长变宽

Question

I'm trying to reshape my table long to wide using the data column in the table. The data looks like this:

ID    Revenue      Year
456    78645       2015
456    52134       2016
456    95431       2017
735    65423       2015
735    25357       2016
735    65732       2017

I'm trying to reshape the table long to wide like this:

ID      2015      2016     2017
456    78645     52134     95431
735    65423     25357     65732 

Is there a way to do it in SQL Server? Thanks.

Answer 1

You can do it by creating and executing dynamic sql query.

Query

declare @query as varchar(max);
set @query = 'select [id], ';
select @query += stuff((
        select distinct ',sum(case [year] when '+ 
        cast([year] as varchar(4)) +
        ' then [revenue] end) as [' + cast([year] as varchar(4)) + ']'
        from [table_name]
        for xml path('')
    ),
    1,1, ''
);
set @query += ' from [table_name] group by [id];';

exec(@query);