Browse Products with three level nested queries : Level « Hierarchical Query « Oracle PL / SQL

1. Oracle PL / SQL
2. Hierarchical Query
3. Level

Browse Products with three level nested queries

 
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> SELECT ProductID, Name FROM
  2       (SELECT ProductID, Name, ROWNUM AS rn FROM
  3            (SELECT ProductID, Name
  4             FROM Product
  5             ORDER BY ProductID)
  6       ) inner
  7  WHERE inner.rn BETWEEN 6 AND 10;

 PRODUCTID NAME
---------- --------------------------------------------------
         6 Keyboard

1 row selected.

SQL>
SQL> drop table product;

Table dropped.

SQL> drop sequence ProductIDSeq;

Sequence dropped.

   
  

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