Question

我创建了四个表，给出了层次类别列表。像分类表;

+----+--------------+---------------+----------------+
| ID | CategoryName | Ref. Category | Something else |
+----+--------------+---------------+----------------+

参考。类别（链接到第1列）

作为一个例子;

+---+------------+---+------+
| 1 | Elektronik | 0 | ...  |
| 2 | Drink      | 0 | ...  |
| 3 | Computer   | 1 | ...  |
| 4 | Mouse      | 3 | ...  |
| 5 | Keyboard   | 3 | ...  |
| 6 | Juice      | 2 | ...  |
| 7 | Mouse Cable| 4 | ...  |
+---+------------+---+------+

员工表：

+------------+------+---------+-----------+
| EmployeeID | Name | Surname | Something |
+------------+------+---------+-----------+

订单表：

+---------+-------+------+-----------+
| OrderID | EmpID | Date | Something |
+---------+-------+------+-----------+

OrderDetails表：

+---------+-----------+----------+-------+------------+
| OrderID | ProductID | Quantity | Price | CategoryID |
+---------+-----------+----------+-------+------------+

我希望得到特定员工特定类别及以上级别的总价格（参考类别最高为0级）总价格如同 for EmployeeID 10

+-----------+------------+--------------+---------------+
| EmployeeID| CategoryId | CategoryName | Total Prices  |
| 10        |    7       | Mouse Cable  | 3000          |
| 10        |    4       | Mouse        | 5000          |
| 10        |    3       | Computer     | 12000         |
| 10        |    1       | Elektronik   | 35000         |
+-----------+------------+--------------+---------------+

我想创建一个以特定RefID开始的查询，然后使用CategoryID，在下一步中，RefId将是CategoryID并继续像RefID 0那样

Answer 1

答案很长但查询下方适合你

DECLARE @rowResult TABLE (
    EmployeeID int,
    CategoryID int,
    Total int);
DECLARE @EmployeeID int;
DECLARE @CategoryID int;
DECLARE @RefID int;

SET @EmployeeID = 100;
SET @CategoryID = 7;

SELECT @RefID = RefID FROM CATEGORIES WHERE CategoryID = @CategoryID;

WHILE @RefID > 0
BEGIN

    INSERT INTO @rowResult
    SELECT e.EmployeeID, d.CategoryID, SUM(d.Quantity * d.Price) AS 'Total'
    FROM Employees e 
      INNER JOIN Orders o ON o.EmpID = e.EmployeeID
      INNER JOIN OrderDetails d ON d.OrderID = o.OrderID
    WHERE e.EmployeeID = @EmployeeID AND d.CategoryID = @CategoryID
    GROUP BY e.EmployeeID, d.CategoryID ;

    SET  @CategoryID = @RefID;
SELECT @RefID = RefID FROM CATEGORIES WHERE CategoryID = @CategoryID;
END

SELECT * FROM @rowResult
GO

Answer 2

Runnnig代码如下 http://rextester.com/VSNF73112

分类

CREATE TABLE CATEGORIES (
  CategoryID int NOT NULL PRIMARY KEY,
  CategoryName nvarchar(255),
  RefID int,
  Detail nvarchar(255)
);

EMPLOYEES

CREATE TABLE EMPLOYEES (
  EmployeeID int NOT NULL PRIMARY KEY,
  Name nvarchar(255),
  SurName nvarchar(255),
  Detail nvarchar(255)
);

订单明细

CREATE TABLE OrderDetails (
  OrderID int,
  ProductID int,
  Quantity int,
  Price int,
  CategoryID int
);

订单

 CREATE TABLE Orders (
      OrderID int,
      EmpID int
    );

ALTER TABLE CATEGORIES
ADD FOREIGN KEY (RefID) REFERENCES CATEGORIES(CategoryID);
GO

Level -Sublevel类型表的SQL表模式

2 个答案: