Tsql 将空值更改为零（透视表）

我创建了一个存储过程，它创建了数据透视表，如下所示。问题是，它不能像预期的那样工作，因为它不会将空值更改为零。你能告诉我正确的方向吗

create procedure sp_system_counts
as

declare @columns nvarchar(max)
declare @columnscondition nvarchar(max)
declare @query nvarchar(max)

select distinct systemgroup, systemgroupsortorder into #temp_table_system_group
from systemgroups
where systemgroup not like 'N/A'
order by systemgroupsortorder

select @columns = isnull(@columns + ',', '') + '[' +  convert(varchar, systemgroup) + ']' FROM #temp_table_system_group

select @columnscondition =  + isnull(@columnscondition + ' or ', '') + '[' +  convert(varchar, systemgroup) + '] <> 0' FROM #temp_table_system_group
--select @columns

create table #temp_systems (
    systemid int,
    systemnane varchar(max),
    region varchar(50),
    systemgroup varchar(50),
    remsid int,
    remscode int)

insert into #temp_systems

select distinct sy.systemid, sy.systemname, co.region, syg.systemgroup, re.remsid, re.remscode
from systems sy
    inner join servers se on sy.systemid = se.systemid and sy.systemid = sy.systemid
    inner join rems re on se.remsid = re.remsid
    inner join cities ci on re.cityid = ci.cityid
    inner join countries co on ci.countryid = co.countryid
    inner join systemmodels sym on sy.systemmodelid = sym.systemmodelid
    inner join systemtypes syt on sym.systemtypeid = syt.systemtypeid
    inner join systemgroups syg on syt.systemgroupid = syg.systemgroupid
    where syg.systemgroup not like 'N/A'
order by syg.systemgroup

set @query = '
    select region, ' + @columns + '
    from (
        select distinct region, systemgroup, cnt = isnull(count(systemid),0) from #temp_systems
        group by region, systemgroup
        with rollup) p
            pivot (sum (cnt) for systemgroup in (' + @columns + ')) as asd
            where (' + @columnscondition +')' 

execute(@query)

drop table #temp_table_system_group
drop table #temp_systems

---

我不确定这里实现的逻辑是什么，但如果您更改以下内容，它可能会有所帮助：

select @columns = isnull(@columns + ',', '') + '[' +  convert(varchar, systemgroup) + ']' FROM #temp_table_system_group
select @columnscondition =  + isnull(@columnscondition + ' or ', '') + '[' +  convert(varchar, systemgroup) + '] <> 0' FROM #temp_table_system_group

到

i、 e.在数据透视之前，而不是在数据透视之前，对数据透视执行isnull..0

select @columns = isnull(@columns + ',', '') + 'isnull(' + quotename(convert(varchar, systemgroup)) + ', 0) as ' + quotename(convert(varchar, systemgroup)) FROM #temp_table_system_group
select @columnscondition =  + isnull(@columnscondition + ' or ', '') + 'isnull(' + quotename(convert(varchar, systemgroup)) + ', 0) <> 0' FROM #temp_table_system_group