SQL 拼接字符串參數報錯轉換成數據類型 int 時失敗

set @sql='insert into '+@ltable+'(ywyID,ywymc,bmmc,deptpath,sjbmmc,iysSum) select ywyID,ywymc,bmmc,deptpath,sjbmmc,sum(iSum) iSum from (select ywyID,ywymc,bmmc,deptpath,sjbmmc,isnull(ycye,0) iSum from '+@TEMP_ysmxtb+' where xdqr<'''+@nextdate+''' union all select ywyID,ywymc,bmmc,deptpath,sjbmmc,isnull(bqxs,0) iSum from '+@TEMP_ysmxtb

set @strSql=' where zq =0 and year(CONVERT(datetime,xdqr))= '+CONVERT(varchar(4),@iyear)+' and month(CONVERT(datetime,xdqr))='+CONVERT(varchar(4),@imonth)+') a group by ywyID,ywymc,bmmc,deptpath,sjbmmc'

print (@sql+@strSql)
exec(@sql+@strSql)
--@iyear和@imonth傳的都是int  拼字符串時，必須先轉成字符串，不然會報錯

--and year(CONVERT(datetime,xdqr))='+@iyear+' and month(CONVERT(datetime,xdqr))='+@imonth+'