Question

我很难将这篇文章命名为。

我们如何完成以下任务？

SELECT 'Body' AS LineType, ItemName, Quantity FROM TableX
UNION ALL
SELECT 'Body' AS LineType, ItemName, Quantity FROM TableY
UNION ALL
SELECT 'Trailer' AS LineType, null As ItemName, <count of the above two SELECTs>

结果应如下所示：

LineType     ItemName     Qty
Body         Nut          19
Body         Bolt         25
Trailer      NULL         2

请帮忙;谢谢SOF社区。

Answer 1

尝试CTE：

;WITH FirstQ AS 
(
    SELECT 'Body' AS LineType, ItemName, Quantity FROM TableX
), SecondQ AS 
(
    SELECT 'Body' AS LineType, ItemName, Quantity FROM TableY
)
SELECT * FROM FirstQ
UNION ALL SELECT * FROM SecondQ
UNION ALL
SELECT 'Trailer' AS LineType, null As ItemName, ((SELECT COUNT(*) FROM FirstQ) +(SELECT COUNT(*) FROM SecondQ)) AS Quantity

工作示例代码：

declare @TableX table (ItemName varchar(5), Quantity int)
INSERT @TableX VALUES ('aa',10)
INSERT @TableX VALUES ('bb',20)

declare @TableY table (ItemName varchar(5), Quantity int)
INSERT @TableX VALUES ('cc',30)

;WITH FirstQ AS 
(
    SELECT 'Body' AS LineType, ItemName, Quantity FROM @TableX
), SecondQ AS 
(
    SELECT 'Body' AS LineType, ItemName, Quantity FROM @TableY
)
SELECT * FROM FirstQ
UNION ALL SELECT * FROM SecondQ
UNION ALL
SELECT 'Trailer' AS LineType, null As ItemName, ((SELECT COUNT(*) FROM FirstQ) +(SELECT COUNT(*) FROM SecondQ)) AS Quantity

输出：

LineType ItemName Quantity
-------- -------- -----------
Body     aa       10
Body     bb       20
Body     cc       30
Trailer  NULL     3

(4 row(s) affected)

Answer 2

declare @TableX table (ItemName varchar(10),Quantity int)
declare @TableY table (ItemName varchar(10),Quantity int)

insert @tableX VALUES('door',0)
insert @tableX VALUES('window',10)
insert @tableX VALUES('wheel',5)
insert @tableX VALUES('brake',7)
insert @tableX VALUES('handle',3)
insert @tableX VALUES('lamp',207)

insert @tableY VALUES('Ydoor',0)
insert @tableY VALUES('Ywindow',10)
insert @tableY VALUES('Ywheel',5)
insert @tableY VALUES('Ybrake',7)
insert @tableY VALUES('Yhandle',3)
insert @tableY VALUES('Ylamp',207)

SELECT 'Body' as LineType, ItemName, Sum(Quantity) qty, Count(*) [count] FROM
(
SELECT ItemName, Quantity FROM @TableX
UNION
SELECT ItemName, Quantity FROM @TableY
) u

GROUP BY ItemName WITH ROLLUP

3个SELECT中的2个与UNION组合返回的行数

2 个答案: