如何在mysql中添加两个求和值

Question

Is it possible to add two summed values in mysql like the query shown below (figure 1)?

I have the query below, and I am trying to add qty and pro.

Figure 1

    SELECT  

    SUM(CASE WHEN value > 0 AND xp = 0 THEN 1 ELSE 0 END) AS qty,
    SUM(CASE WHEN value > 1 AND xp = 2 THEN 1 ELSE 0 END) AS pro

    SUM(pro + qty)

    FROM OrderDetails;

I will need to use qty and pro many times throughout the query, so I don't want to write the query as shown in figure 2

figure 2

    SELECT  

    SUM(
    SUM(CASE WHEN value > 0 AND xp = 0 THEN 1 ELSE 0 END)
    + 
    SUM(CASE WHEN value > 1 AND xp = 2 THEN 1 ELSE 0 END)
    )

    FROM OrderDetails;

EDITED

What I mean by using qty and pro multiple times throughout the query is something like the following.

Query Example one - is what I am trying to do, where I can reuse qty and pro multiple times throughout the query, in places like sum(pro + qty) and having (qty > 0 AND pro > 0) , without having to rewrite the whole sum statement.

SELECT  

SUM(CASE WHEN value > 0 AND xp = 0 THEN 1 ELSE 0 END) AS qty,
SUM(CASE WHEN value > 1 AND xp = 2 THEN 1 ELSE 0 END) AS pro

SUM((pro + qty)/100)

FROM OrderDetails

GROUP BY value

HAVING (
       qty > 2
       AND
       pro > 2
       )
;

query example 2 - is what I have to currently do, and it seems like very poor practice to have to rewrite SUM(CASE WHEN value > 0 AND xp = 0 THEN 1 ELSE 0 END) multiple times, rather than a simple qty or pro like in the query above

SELECT  

SUM(CASE WHEN value > 0 AND xp = 0 THEN 1 ELSE 0 END) AS qty,
SUM(CASE WHEN value > 1 AND xp = 2 THEN 1 ELSE 0 END) AS pro

SUM((
     SUM(CASE WHEN value > 0 AND xp = 0 THEN 1 ELSE 0 END)
      +
     SUM(CASE WHEN value > 1 AND xp = 2 THEN 1 ELSE 0 END)
)/100)

FROM OrderDetails

GROUP BY value

HAVING (
       SUM(CASE WHEN value > 0 AND xp = 0 THEN 1 ELSE 0 END) > 2
       AND
       SUM(CASE WHEN value > 1 AND xp = 2 THEN 1 ELSE 0 END) > 2
       )
;

is there no way to add SUM(pro + qty) after defining it once in examples like SUM(CASE WHEN value > 0 AND xp = 0 THEN 1 ELSE 0 END) AS qty

Answer 1

You can compute using the below query.

SELECT  

SUM(CASE WHEN value > 0 AND xp = 0 THEN 1 ELSE 0 END) AS qty,
SUM(CASE WHEN value > 1 AND xp = 2 THEN 1 ELSE 0 END) AS pro,
SUM(CASE 
        WHEN value > 0 AND xp = 0 THEN 1
        WHEN value > 1 AND xp = 2 THEN 1 
    ELSE 0 END) AS qtyProSum
FROM OrderDetails;

Answer 2

Create View for the below query and use it any of times

SELECT  
    SUM(CASE WHEN value > 0 AND xp = 0 THEN 1 ELSE 0 END) AS qty,
    SUM(CASE WHEN value > 1 AND xp = 2 THEN 1 ELSE 0 END) AS pro
    FROM OrderDetails;