如果值为零，如何在sql中添加多个sum语句它返回总额为零如何添加多个sum语句答案

【问题标题】：How to add the multiple sum statement in sql if value has zero it returns total amount to zero how to add in multiple sum statement如果值为零，如何在sql中添加多个sum语句它返回总额为零如何添加多个sum语句
【发布时间】：2018-02-28 08:08:37
【问题描述】：

(sum (当 NATIONALITY != 'Saudi' and DIVISION='Dammam Central' and STATUS is null then (current_salary) end))-(sum (case when NATIONALITY != 'Saudi' and DIVISION='Dammam Central' ' 和 internal_transfer_from in ('Dammam Central','Dammam East','Jeddah SMPT','Jubail','hadeed MTO','Hadeed FPH','IBN Rushd') then (current_salary) end))+((sum （当 NATIONALITY != 'Saudi' and internal_transfer_from='Dammam Central' then (current_salary) end))）作为 Dammam_Central，

【问题讨论】：

标签： sql-server

【解决方案1】：

这就是你要找的东西

isnull((sum (case when NATIONALITY != 'Saudi' and DIVISION='Dammam Central' and STATUS is null then (current_salary) end)),0)-
isnull((sum (case when NATIONALITY != 'Saudi' and DIVISION='Dammam Central' and internal_transfer_from in ('Dammam Central','Dammam East','Jeddah SMPT','Jubail','hadeed MTO','Hadeed FPH','IBN Rushd') then (current_salary) end)),0)+
isnull(((sum (case when NATIONALITY != 'Saudi' and internal_transfer_from='Dammam Central' then (current_salary) end))),0) as Dammam_Central,

注意：仅供参考Handling Nulls

【讨论】：

【解决方案2】：

使用 coalesce(fieldname,0) = casesum(fieldnames) = 0 然后 sum() else sum() end

上面的示例

COALESCE(sum (case when NATIONALITY != 'Saudi' and DIVISION='Dammam Central' and STATUS is null then (current_salary) end)),0)- COALESCE(sum (case when NATIONALITY != 'Saudi' and DIVISION='Dammam Central' and internal_transfer_from in ('Dammam Central','Dammam East','Jeddah SMPT','Jubail','hadeed MTO','Hadeed FPH','IBN Rushd') then (current_salary) end)),0)+(COALESCE(sum (case when NATIONALITY != 'Saudi' and internal_transfer_from='Dammam Central' then (current_salary) end)),0) as Dammam_Central

【讨论】：

上面那个是什么意思