Question

是否可以像下面所示的查询一样在mysql中添加两个求和值（图1）？

我在下面有查询，并且我想添加数量和亲。

图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;

我将需要在整个查询中多次使用qty和pro，所以我不想编写图2

中所示的查询

图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;

已编辑

在整个查询中多次使用 qty 和 pro 的意思是类似以下内容。

查询示例一-我正在尝试做的是，在整个查询过程中，我可以在sum(pro + qty)和having (qty > 0 AND pro > 0)之类的地方多次重复使用pro和pro，无需重写整个sum语句。

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
       )
;

查询示例2 -我目前要做的是，必须多次重写SUM(CASE WHEN value > 0 AND xp = 0 THEN 1 ELSE 0 END)而不是简单的 qty < / strong>或 pro ，如上面的查询

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 ) ;

在像SUM(pro + qty)这样的示例中定义一次后，无法添加SUM(CASE WHEN value > 0 AND xp = 0 THEN 1 ELSE 0 END) AS qty

Answer 1

您可以使用以下查询进行计算。

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

为以下查询创建视图并随时使用

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;

如何在mysql中添加两个求和值

2 个答案: