Question

假设我在SQL Server 2008 R2中有一个名为Purchase的表，其中有两列：Purchaser和Expenditure。

假设该表格包含以下行：

Purchaser    Expenditure
---------    -----------
Alex         200
Alex         300
Alex         500
Bob          300
Bob          400
Charlie      200
Charlie      600
Derek        100
Derek        300

现在我有了这个问题：

SELECT Purchaser, Expenditure, SUM(Expenditure) AS SumExpenditure FROM Purchase GROUP BY Purchaser, Expenditure WITH ROLLUP

返回以下内容：

Purchaser    Expenditure    SumExpenditure
---------    -----------    --------------
Alex         200            200
Alex         300            300
Alex         500            500
--------------------------------
Alex         NULL           1000
--------------------------------
Bob          300            300
Bob          400            400
--------------------------------
Bob          NULL           700
--------------------------------
Charlie      200            200
Charlie      600            600
--------------------------------
Charlie      NULL           800
--------------------------------
Derek        100            100
Derek        300            300
--------------------------------
Derek        NULL           400
--------------------------------

（添加了一些行以强调累计金额。）

我希望能够按分组数量对组进行排序，以便最终得到如下结果集：

Purchaser    Expenditure    SumExpenditure
---------    -----------    --------------
Derek        100            100
Derek        300            300
--------------------------------
Derek        NULL           400
--------------------------------
Bob          300            300
Bob          400            400
--------------------------------
Bob          NULL           700
--------------------------------
Charlie      200            200
Charlie      600            600
--------------------------------
Charlie      NULL           800
--------------------------------
Alex         200            200
Alex         300            300
Alex         500            500
--------------------------------
Alex         NULL           1000
--------------------------------

换句话说，我正在使用组行中的400，700，800和1000按升序对组进行排序。

有人可以建议哪些查询会返回此结果集吗？

Answer 1

;WITH x AS 
(
    SELECT Purchaser, Expenditure, s = SUM(Expenditure) 
    FROM dbo.Purchase 
    GROUP BY Purchaser, Expenditure WITH ROLLUP
),
y AS 
(
    SELECT Purchaser, s FROM x 
    WHERE Expenditure IS NULL
    AND Purchaser IS NOT NULL
),
z AS 
(
    SELECT Purchaser, s, rn = ROW_NUMBER() OVER (ORDER BY s)
    FROM y
)
SELECT x.Purchaser, x.Expenditure, x.s FROM x 
INNER JOIN z ON x.Purchaser = z.Purchaser
ORDER BY z.rn, CASE WHEN z.s IS NULL THEN 2 ELSE 1 END;

如何按汇总组排序？

1 个答案: