动态 Pivot 按月表

Question

I'm trying to create a dynamic pivot table in SQL that will report based on month and year. I did a bunch of research and was able to come up with the below query:

declare @dynamic nvarchar(max),
@column nvarchar(max);

set @column = N'';
select @column += N'' + datename(month,incurdate) +' '+ datename(year,incurdate) + ',' 
from (select distinct a.incurdate from artable a) as Transpose

select @column = substring(@column,0,len(@column))

set @dynamic = 'select * from
 (
select month, incurdate, dolamount
from artable join dolentry on month = period
) b
pivot(sum(dolamount) for incurdate in (' + @column + ')) as PivotTable'

execute sp_executesql @dynamic

I am able to print the @column variable successfully, but the problems happen when I try to set it in the @dynamic variable. The error message is ' Msg 102, Level 15, State 1, Line 6 Incorrect syntax near '1990'. ' 1990 is the first year of the first pivoted column. Any help or tips are appreciated. Thanks!

Answer 1

You need to use QUOTENAME in the following code:

select @column += N'' + QUOTENAME(datename(month,incurdate) +' '+ datename(year,incurdate)) + ',' 
from (select distinct a.incurdate from artable a) as Transpose

in order to get output like this:

[col01], [col02], [col03], ... , [col04]

As you can see from the docs , the PIVOT syntax requires the pivoting columns to be wrapped in square brackets:

SELECT <non-pivoted column>,  
    [first pivoted column] AS <column name>,  
    [second pivoted column] AS <column name>,  
    ...  
    [last pivoted column] AS <column name>  
FROM  
    (<SELECT query that produces the data>)   
    AS <alias for the source query>  
PIVOT  
(  
    <aggregation function>(<column being aggregated>)  
FOR   
[<column that contains the values that will become column headers>]   
    IN ( [first pivoted column], [second pivoted column],  
    ... [last pivoted column])  
) AS <alias for the pivot table>  
<optional ORDER BY clause>;