Get Products: RANK() OVER in subquery

  
SQL>
SQL>
SQL> CREATE TABLE Product (
  2  ProductID INT NOT NULL PRIMARY KEY,
  3  Name VARCHAR(50) NOT NULL,
  4  Description VARCHAR(1000) NOT NULL,
  5  Price NUMBER NULL,
  6  ImagePath VARCHAR(50) NULL,
  7  soldout NUMBER(1,0) NULL,
  8  Promotion NUMBER(1,0) NULL);

Table created.

SQL>
SQL> CREATE SEQUENCE ProductIDSeq;

Sequence created.

SQL>
SQL> CREATE OR REPLACE TRIGGER ProductAutonumberTrigger
  2  BEFORE INSERT ON Product
  3  FOR EACH ROW
  4  BEGIN
  5     SELECT ProductIDSeq.NEXTVAL
  6     INTO :NEW.ProductID FROM DUAL;
  7  END;
  8  /

Trigger created.

SQL>
SQL> INSERT INTO Product (Name, Description, Price, ImagePath,soldout, Promotion)
  2  VALUES ('Pen', 'Ball Pen',5.99, 'pen.jpg', 1, 0);

1 row created.

SQL>
SQL> INSERT INTO Product (Name, Description, Price, ImagePath, soldout, Promotion)
  2  VALUES ('Ruler', 'Long',14.99, 'ruler.jpg', 0, 0);

1 row created.

SQL>
SQL> INSERT INTO Product (Name, Description, Price, ImagePath, soldout, Promotion)
  2  VALUES ('Desk', 'Computer Desk',5.99, 'desk.jpg', 0, 1);

1 row created.

SQL>
SQL> INSERT INTO Product (Name, Description, Price, ImagePath, soldout, Promotion)
  2  VALUES ('PC', 'Notebook',49.99, 'pc.jpg', 0, 1);

1 row created.

SQL>
SQL> INSERT INTO Product (Name, Description, Price, ImagePath, soldout, Promotion)
  2  VALUES ('Mouse', 'Wireless',9.99, 'mouse.jpg',  1, 0);

1 row created.

SQL>
SQL> INSERT INTO Product (Name, Description, Price, ImagePath, soldout, Promotion)
  2  VALUES ('Keyboard', 'keyboard',3.75, 'keyboard.jpg', 0, 0);

1 row created.

SQL>
SQL> CREATE TABLE ProductCategory (
  2  ProductID INT NOT NULL,
  3  CategoryID INT NOT NULL,
  4  PRIMARY KEY (ProductID, CategoryID)
  5  );

Table created.

SQL>
SQL>
SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (1,3);

1 row created.

SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (2,1);

1 row created.

SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (2,3);

1 row created.

SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (3,3);

1 row created.

SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (4,1);

1 row created.

SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (5,2);

1 row created.

SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (6,3);

1 row created.

SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (6,4);

1 row created.

SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (7,4);

1 row created.

SQL> INSERT INTO ProductCategory (ProductID, CategoryID) VALUES (8,5);

1 row created.

SQL>
SQL>
SQL> CREATE TABLE Category (
  2  CategoryID INT NOT NULL PRIMARY KEY,
  3  DepartmentID INT NOT NULL,
  4  Name VARCHAR(50) NOT NULL,
  5  Description VARCHAR (200) NULL);

Table created.

SQL>
SQL> CREATE SEQUENCE CategoryIDSeq;

Sequence created.

SQL>
SQL> CREATE OR REPLACE TRIGGER CategoryAutonumberTrigger
  2  BEFORE INSERT ON Category
  3  FOR EACH ROW
  4  BEGIN
  5     SELECT CategoryIDSeq.NEXTVAL
  6     INTO :NEW.CategoryID FROM DUAL;
  7  END;
  8  /

Trigger created.

SQL> INSERT INTO Category (DepartmentID, Name, Description) VALUES (1, 'Local', 'In town');

1 row created.

SQL> INSERT INTO Category (DepartmentID, Name, Description) VALUES (1, 'Remote', 'Telecommute');

1 row created.

SQL> INSERT INTO Category (DepartmentID, Name, Description) VALUES (2, 'Masks', 'By bits');

1 row created.

SQL> INSERT INTO Category (DepartmentID, Name, Description) VALUES (3, 'Wireless', 'Not connected');

1 row created.

SQL> INSERT INTO Category (DepartmentID, Name, Description) VALUES (3, 'Wired', 'Connected');

1 row created.

SQL>
SQL> SELECT CategoryName, ProductName, ProductPrice
  2    FROM
  3      (SELECT C.Name as CategoryName,
  4              P.Name as ProductName,
  5              P.Price as ProductPrice,
  6              RANK() OVER (PARTITION BY C.Name ORDER BY P.Price DESC)
  7              AS rank
  8       FROM Product P
  9       JOIN ProductCategory PC ON P.ProductID = PC.ProductID
 10       JOIN Category C ON C.CategoryID = PC.CategoryID)
 11  WHERE rank <= 2
 12  ORDER BY CategoryName;

CATEGORYNAME
--------------------------------------------------
PRODUCTNAME                                        PRODUCTPRICE
-------------------------------------------------- ------------
Local
PC                                                        49.99

Local
Ruler                                                     14.99

Masks
Ruler                                                     14.99

Masks
Pen                                                        5.99

Masks
Desk                                                       5.99

Remote
Mouse                                                      9.99

Wireless
Keyboard                                                   3.75


7 rows selected.

SQL>
SQL>
SQL> drop table Product;

Table dropped.

SQL> drop table ProductCategory;

Table dropped.

SQL> drop table Category;

Table dropped.

SQL> drop sequence CategoryIDSeq;

Sequence dropped.

SQL> drop sequence ProductIDSeq;

Sequence dropped.

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Get Products: RANK() OVER in subquery : Over « Analytical Functions « Oracle PL / SQL

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