2之和在SQL中的select语句具有不同的where子句

Question

I am trying to get the sum of 2 columns in one table but with different where the condition, the only difference is the amount per department is calculated based on 17% Margin. The Result should be the total revenue grouped by Event Name and Event ID.

for a sql Report, I have written 2 sql statements with different conditions and got the correct value for 2 columns but separately, i have summed both in a way but it was for one event.

SELECT EVT_ID, Event_Desc, Sum(Order_Total) as Total + (Select SUm(Order_Total *0.17) as Total from Orders Join Events EM On OrD.EVT_ID = EV.EVENTS_ID 
where EVT_START_DATE between '2019-01-01' and '2019-01-31' Order_Department = 'FAB'  )
From Orders Join Events EM On OrD.EVT_ID = EV.EVENTS_ID 
where EVT_START_DATE between '2019-01-01' and '2019-01-31' Order_Department <> 'FAB'  
Group by EVT_ID, Event_Desc

Answer 1

select EVT_ID, Event_Desc, sum(Total)as Total 
from 
(
SELECT EVT_ID, Event_Desc, Sum(Order_Total) as Total 
 From Orders 
 Join Events EM On OrD.EVT_ID = EV.EVENTS_ID 
 where EVT_START_DATE between '2019-01-01' and '2019-01-31' and Order_Department <> 'FAB'
Group by EVT_ID, Event_Desc 
 union
Select EVT_ID, Event_Desc, SUm(Order_Total *0.17) as Total 
from Orders 
Join Events EM On OrD.EVT_ID = EV.EVENTS_ID 
 where EVT_START_DATE between '2019-01-01' and '2019-01-31' and Order_Department = 'FAB' )  tbl   
 Group by EVT_ID, Event_Desc

OR

 SELECT EVT_ID, Event_Desc, Sum(case when Order_Department = 'FAB' then Order_Total else Order_Total *0.17 end ) as Total 
 From Orders 
 Join Events EM On OrD.EVT_ID = EV.EVENTS_ID 
 where EVT_START_DATE between '2019-01-01' and '2019-01-31'  
Group by EVT_ID, Event_Desc 

Answer 2

If I followed you correctly, you could approach this with conditional aggregation . You can use a CASE construct within the SUM aggregate function to check to which departement the current record belongs to and do the computation accordingly.

SELECT
    o.evt_id,
    event_desc,
    SUM(CASE 
        WHEN order_department = 'FAB' THEN order_total * 0.17 
        ELSE order_total END
    ) AS Total
FROM orders o
INNER JOIN events e On o.evt_id = e.events_id    
WHERE evt_start_date BETWEEN '2019-01-01' and '2019-01-31'
GROUP BY 
    o.evt_id,
    event_desc

NB: most columns in your query are not prefixed with a table alias, making it unclear from which table they come from. I added them when it was possible to make an educated guess from your sql code, and I would higly recommend that you add prefixes to all of the remaining.