Question

我有这个问题：

select sum(QTYINSTOCK * AVGPRICE) as Albums 
from inventoryinfo
WHERE Category = 'Albums'

它返回：

Albums
$660.80

我有办法在一个查询中运行多个查询并在单个表中返回吗？例如：

select sum(QTYINSTOCK * AVGPRICE) as Albums from inventoryinfo
WHERE Category = 'Albums'
select sum(QTYINSTOCK * AVGPRICE) as Prints from inventoryinfo
WHERE Category = 'Prints'
select sum(QTYINSTOCK * AVGPRICE) as Frames from inventoryinfo
WHERE Category = 'Frames'


Albums  |  $660.80
Prints  |  $123.00
Frames  |  $67.00

====== 看起来像是一致意见是使用联盟结果并没有像我想的那样格式化，它返回

Albums
660.80
123.00
67.00

Answer 1

只需使用GROUP BY：

select Category, sum(QTYINSTOCK * AVGPRICE) as Total from inventoryinfo
WHERE Category IN ('Albums', 'Prints', 'Frames')
GROUP BY Category

或者，如果您希望结果包含多个列：

select 
    SUM(CASE WHEN Category ='Albums' THEN QTYINSTOCK * AVGPRICE ELSE 0 END) as Albums END
    SUM(CASE WHEN Category ='Prints' THEN QTYINSTOCK * AVGPRICE ELSE 0 END) as Prints END
    SUM(CASE WHEN Category ='Frames' THEN QTYINSTOCK * AVGPRICE ELSE 0 END) as Frames END
FROM inventoryinfo
WHERE Category IN ('Albums', 'Prints', 'Frames')
GROUP BY Category

Answer 2

您可以使用Union来执行此操作。请记住，如果您以后决定在结果中添加额外的列，则每个选择必须返回相同数量的列。

select sum(QTYINSTOCK * AVGPRICE) as Albums, 'Albums' as Type from inventoryinfo
WHERE Category = 'Albums'
UNION ALL
select sum(QTYINSTOCK * AVGPRICE) as Prints ,'Prints' as Type from inventoryinfo
WHERE Category = 'Prints'
UNION ALL
select sum(QTYINSTOCK * AVGPRICE) as Frames,'Frames' as Type from inventoryinfo
WHERE Category = 'Frames'

Answer 3

工会经营者：

select "ten", 10
union
select "twenty", 20
union
select "thirty", 30

产生

ten    | 10
twenty | 20
thirty | 30

单个表中的多个查询结果

3 个答案: