Sql 从一列中减去和

我的桌子看起来与此相似：

LocalAmount Firm_id Date    StoreCard_Id
1000        5532    46,545  14124
2000        5325    46,545  13124
30000       25235   46,545  14141
1500        2525    46,545  14214
2134        25235   46,545  14241
144150      2525    46,545  41441

我可以用下面的代码计算一年内的本地金额：

select sum(II2.LocalTAmountWithoutVAT) as "Celkem"
from IssuedInvoices2 II2
join IssuedInvoices II on II.id = II2.parent_id
join firms F on F.id = II.firm_id
left join StoreCards SC on II2.StoreCard_ID = SC.ID
left join ABI_StoreCardsWithMenu(sc.ID) SCWM on SCWM.OUT_StoreCard_ID = SC.id
where
     ib_decodedate_year(II.docdate$date) = EXTRACT(YEAR FROM CURRENT_DATE)
    and F.id = '@{_firmID}'
group by 
    out_menu1Text
order by
    out_menu1Text

但我需要在两年内做同样的事情，并减去这两个总数。它必须在一个SQL代码中

对不起，我对我的问题解释不好，但我不知道怎样才能更好地解释它。

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Thx用于所有回复。

您可以使用条件聚合来完成此操作：

select sum(case when ib_decodedate_year(II.docdate$date) = EXTRACT(YEAR FROM CURRENT_DATE) 
                then II2.LocalTAmountWithoutVAT
                else 0
           end) as ThisYear,
       sum(case when ib_decodedate_year(II.docdate$date) = EXTRACT(YEAR FROM CURRENT_DATE) - 1
                then II2.LocalTAmountWithoutVAT
                else 0
           end) as LastYear,
       (sum(case when ib_decodedate_year(II.docdate$date) = EXTRACT(YEAR FROM CURRENT_DATE) 
                 then II2.LocalTAmountWithoutVAT
                 else 0
            end) -
        sum(case when ib_decodedate_year(II.docdate$date) = EXTRACT(YEAR FROM CURRENT_DATE) - 1
                then II2.LocalTAmountWithoutVAT
                else 0
           end)
       ) as Diff       
from IssuedInvoices2 II2 join
     IssuedInvoices II
     on II.id = II2.parent_id join
     firms F
     on F.id = II.firm_id left join
     StoreCards SC on II2.StoreCard_ID = SC.ID left join
     ABI_StoreCardsWithMenu(sc.ID) SCWM
     on SCWM.OUT_StoreCard_ID = SC.id
where F.id = '@{_firmID}'
group by  out_menu1Text
order by out_menu1Text;

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可以使用条件聚合执行此操作：

select sum(case when ib_decodedate_year(II.docdate$date) = EXTRACT(YEAR FROM CURRENT_DATE) 
                then II2.LocalTAmountWithoutVAT
                else 0
           end) as ThisYear,
       sum(case when ib_decodedate_year(II.docdate$date) = EXTRACT(YEAR FROM CURRENT_DATE) - 1
                then II2.LocalTAmountWithoutVAT
                else 0
           end) as LastYear,
       (sum(case when ib_decodedate_year(II.docdate$date) = EXTRACT(YEAR FROM CURRENT_DATE) 
                 then II2.LocalTAmountWithoutVAT
                 else 0
            end) -
        sum(case when ib_decodedate_year(II.docdate$date) = EXTRACT(YEAR FROM CURRENT_DATE) - 1
                then II2.LocalTAmountWithoutVAT
                else 0
           end)
       ) as Diff       
from IssuedInvoices2 II2 join
     IssuedInvoices II
     on II.id = II2.parent_id join
     firms F
     on F.id = II.firm_id left join
     StoreCards SC on II2.StoreCard_ID = SC.ID left join
     ABI_StoreCardsWithMenu(sc.ID) SCWM
     on SCWM.OUT_StoreCard_ID = SC.id
where F.id = '@{_firmID}'
group by  out_menu1Text
order by out_menu1Text;