Syntax error converting the varchar value '' 'to a column of data type int
declare @sql1 nvarchar(4000)
set @sql1 = 'select a.[owner] '
select @sql1 = @sql1 + ' , sum(case a.week when ''' + week + ''' then a.productivity_target else 0 end)[' + week + '],sum(case a.week when ''' + week + ''' then a.productivity_contribution else 0 end) [' + week + ']'
from (select distinct week from pfad_productivity a) as t
set @sql1 = @sql1 + ' from pfad_productivity agroup by a.[owner] '
exec(@sql1)

此上是一個存儲過程，其中week字段是整型。
在執行時出錯為：Syntax error converting the varchar value '' then a.productivity_target else 0 end)['to a column of data type int
但是將week字符轉換為字符型，就不會出錯。但是我必須要week為整型，請問我該怎麼解決，謝謝。

------解决方案--------------------

SQL code

declare @sql1 nvarchar(4000)
set @sql1 = 'select a.[owner] '
select @sql1 = @sql1 + ' , sum(case a.week when ''' +ltrim（week）+ ''' then a.productivity_target else 0 end)[' + ltrim（week）+ '],sum(case a.week when ''' + ltrim（week）+ ''' then a.productivity_contribution else 0 end) [' + ltrim（week）+ ']'
from (select distinct week from pfad_productivity a) as t
set @sql1 = @sql1 + ' from pfad_productivity agroup by a.[owner] '
exec(@sql1)