sql server中除法，會遇到除數為0的情況，且保留兩位小數，寫法如下：
select case when num=0 then 0 else convert(decimal(18,2),210.343/num) end as 結果 from tabnumber
select
[carrier] as '承運人分組',
count(*) as '張數',
'0' as '出票效率',
sum(cast(sumprice as int)) as '票面價',
sum(cast([taxprice] as int)) as '基建費',
sum(cast([oilprice] as int)) as '燃油費',
sum(cast(sumprice as int) - cast([flightback] as int)) as '實收費'
from [order_flightdetail] group by [carrier] order by count(*) desc
select
[carrier] as '承運人分組',
count(*) as '張數',
'0' as '出票效率',
sum(convert(decimal(18,2),sumprice)) as '票面價',
sum(convert(decimal(18,2),[taxprice])) as '基建費',
sum(convert(decimal(18,2),[oilprice])) as '燃油費',
sum(convert(decimal(18,2),sumprice) - convert(decimal(18,2),[flightback])) as '實收費'
from [order_flightdetail] where [carrier] <>'' group by [carrier] order by count(*) desc
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